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Italy is divided into 20 regions, which are subdivided into 110 provinces. The provinces have diminished functionality since 2015.

Italy is divided into 101 province (sing. provincia: provinces), 8 metropolitan cities, and Aosta, whose provincial functions are carried out by the regional government of Valle d'Aosta.

Province	Typ	HASC	ISO	CAP	NUTS	Population	Area(km.²)	Area(mi.²)	Capital	Adjective
Agrigento	p	IT.SC.AG	AG	92	ITG14	446,837	3,043	1,175	Agrigento	agrigentini
Alessandria	p	IT.PM.AL	AL	15	ITC18	427,229	3,562	1,375	Alessandria	alessandrini
Ancona	p	IT.MH.AN	AN	60	ITI32	473,865	1,940	749	Ancona	anconetani
Aosta	r	IT.VD.AO	AO	11	ITC20	126,806	3,264	1,260	Aosta	aostani
Arezzo	p	IT.TC.AR	AR	52	ITI18	343,676	3,236	1,250	Arezzo	aretini
Ascoli Piceno	p	IT.MH.AC	AP	63	ITI34	210,407	1,227	474	Ascoli Piceno	ascolani
Asti	p	IT.PM.AT	AT	14	ITC17	217,573	1,511	584	Asti	astigiani
Avellino	p	IT.CM.AV	AV	83	ITF34	429,157	2,792	1,078	Avellino	avellinesi
Bari	m	IT.PU.BB	BA	70	ITF47	1,247,303	3,824	1,476	Bari	baresi
Barletta-Andria-Trani	p	IT.PU.BT	BT	76	ITF48	391,723	1,532	591	Andria, Barletta, Trani
Belluno	p	IT.VN.BL	BL	32	ITH33	210,001	3,679	1,420	Belluno	bellunesi
Benevento	p	IT.CM.BN	BN	82	ITF32	284,900	2,071	800	Benevento	beneventani
Bergamo	p	IT.LM.BG	BG	24	ITC46	1,086,277	2,725	1,052	Bergamo	bergamaschi
Biella	p	IT.PM.BI	BI	13	ITC13	182,192	915	353	Biella	biellesi
Bologna	m	IT.ER.BO	BO	40	ITH55	976,243	3,703	1,430	Bologna	bolognesi
Bolzano	p	IT.TT.BZ	BZ	39	ITH10	504,643	7,403	2,858	Bolzano	bolzanini
Brescia	p	IT.LM.BS	BS	25	ITC47	1,238,044	4,784	1,847	Brescia	bresciani
Brindisi	p	IT.PU.BR	BR	72	ITF44	400,801	1,840	710	Brindisi	brindisini
Cagliari	p	IT.SD.CG	CA	09	ITG27	550,580	4,570	1,764	Cagliari	cagliaritani
Caltanissetta	p	IT.SC.CL	CL	93	ITG15	273,099	2,124	820	Caltanissetta	nisseni
Campobasso	p	IT.ML.CB	CB	86	ITF22	226,419	2,910	1,124	Campobasso	campobassani
Carbonia-Iglesias	p	IT.SD.CI	CI	09	ITG2C	128,540	1,495	577	Carbonia, Iglesias	carboniensi
Caserta	p	IT.CM.CE	CE	81	ITF31	904,921	2,640	1,019	Caserta	casertani
Catania	p	IT.SC.CT	CT	95	ITG17	1,078,766	3,553	1,372	Catania	catanesi
Catanzaro	p	IT.LB.CZ	CZ	88	ITF63	359,841	2,392	924	Catanzaro	catanzaresi
Chieti	p	IT.AB.CH	CH	66	ITF14	387,956	2,590	1,000	Chieti	teatini
Como	p	IT.LM.CO	CO	22	ITC42	586,735	1,289	498	Como	comaschi
Cosenza	p	IT.LB.CS	CS	87	ITF61	714,030	6,652	2,569	Cosenza	cosentini
Cremona	p	IT.LM.CR	CR	26	ITC4A	357,623	1,771	684	Cremona	cremonesi
Crotone	p	IT.LB.KR	KR	88	ITF62	170,803	1,717	663	Crotone	crotoniati
Cuneo	p	IT.PM.CN	CN	12	ITC16	586,378	6,906	2,666	Cuneo	cuneesi
Enna	p	IT.SC.EN	EN	94	ITG16	173,451	2,562	989	Enna	ennesi
Fermo	p	IT.MH.FM	FM	63	ITI35	174,857	861	332	Fermo
Ferrara	p	IT.ER.FE	FE	44	ITH56	353,481	2,633	1,017	Ferrara	ferraresi
Florence	m	IT.TC.FI	FI	50	ITI14	973,145	3,515	1,357	Florence	fiorentini
Foggia	p	IT.PU.FA	FG	71	ITF46	626,072	6,959	2,687	Foggia	foggiani
Forlì-Cesena	p	IT.ER.FO	FC	47	ITH58	390,738	2,377	918	Forlì	forlivesi
Frosinone	p	IT.LZ.FR	FR	03	ITI45	492,661	3,245	1,253	Frosinone	frusinati
Genoa	m	IT.LG.GE	GE	16	ITC33	855,834	1,840	710	Genoa	genovesi
Gorizia	p	IT.FV.GO	GO	34	ITH43	140,143	466	180	Gorizia	goriziani
Grosseto	p	IT.TC.GR	GR	58	ITI1A	220,564	4,504	1,739	Grosseto	grossetani
Imperia	p	IT.LG.IM	IM	18	ITC31	214,502	1,157	447	Imperia	imperiesi
Isernia	p	IT.ML.IS	IS	86	ITF21	87,241	1,530	591	Isernia	isernini
L'Aquila	p	IT.AB.AQ	AQ	67	ITF11	298,343	5,036	1,944	L'Aquila	aquilani
La Spezia	p	IT.LG.SP	SP	19	ITC34	219,330	881	340	La Spezia	spezzini
Latina	p	IT.LZ.LT	LT	04	ITI44	544,732	2,251	869	Latina	latinensi
Lecce	p	IT.PU.LE	LE	73	ITF45	802,018	2,760	1,066	Lecce	leccesi
Lecco	p	IT.LM.LC	LC	23	ITC43	336,310	817	315	Lecco	lecchesi
Livorno	p	IT.TC.LI	LI	57	ITI16	335,247	1,212	468	Livorno	livornesi
Lodi	p	IT.LM.LO	LO	26	ITC49	223,755	782	302	Lodi	lodigiani
Lucca	p	IT.TC.LU	LU	55	ITI12	388,327	1,774	685	Lucca	lucchesi
Macerata	p	IT.MH.MC	MC	62	ITI33	319,607	2,775	1,071	Macerata	maceratesi
Mantua	p	IT.LM.MN	MN	46	ITC4B	408,336	2,340	903	Mantua	mantovani
Massa-Carrara	p	IT.TC.MS	MS	54	ITI11	199,650	1,157	447	Massa	massesi
Matera	p	IT.BC.MT	MT	75	ITF52	200,101	3,450	1,332	Matera	materani
Medio Campidano	p	IT.SD.MD	VS	09	ITG2B	101,256	1,516	585	Sanluri, Villacidro
Messina	p	IT.SC.ME	ME	98	ITG13	649,824	3,248	1,254	Messina	messinesi
Milan	m	IT.LM.MA	MI	20	ITC4C	3,038,420	1,593	615	Milan	milanesi
Modena	p	IT.ER.MO	MO	41	ITH54	685,777	2,689	1,038	Modena	modenesi
Monza e Brianza	p	IT.LM.MZ	MB	20	ITC4D	840,129	388	150	Monza
Naples	m	IT.CM.NA	NA	80	ITF33	3,054,956	1,172	452	Naples	napoletani
Novara	p	IT.PM.NO	NO	28	ITC15	365,559	1,339	517	Novara	novaresi
Nuoro	p	IT.SD.NR	NU	08	ITG26	159,197	3,934	1,519	Nuoro	nuoresi
Ogliastra	p	IT.SD.OG	OG	08	ITG2A	57,329	1,854	716	Lanusei, Tortolì
Olbia-Tempio	p	IT.SD.OT	OT	07	ITG29	150,501	3,399	1,312	Olbia, Tempio Pausania	olbiesi
Oristano	p	IT.SD.ON	OR	09	ITG28	163,916	3,040	1,174	Oristano	oristanesi
Padua	p	IT.VN.PD	PD	35	ITH36	921,361	2,142	827	Padua	padovani
Palermo	p	IT.SC.PA	PA	90	ITG12	1,243,585	4,993	1,928	Palermo	palermitani
Parma	p	IT.ER.PR	PR	43	ITH52	427,434	3,450	1,332	Parma	parmigiani
Pavia	p	IT.LM.PV	PV	27	ITC48	535,822	2,967	1,145	Pavia	pavesi
Perugia	p	IT.UM.PG	PG	06	ITI21	655,844	6,336	2,446	Perugia	perugini
Pesaro e Urbino	p	IT.MH.PS	PU	61	ITI31	362,583	2,893	1,117	Pesaro	pesaresi
Pescara	p	IT.AB.PE	PE	65	ITF13	314,661	1,226	473	Pescara	pescaresi
Piacenza	p	IT.ER.PC	PC	29	ITH51	284,616	2,590	1,000	Piacenza	piacentini
Pisa	p	IT.TC.PI	PI	56	ITI17	411,190	2,446	944	Pisa	pisani
Pistoia	p	IT.TC.PT	PT	51	ITI13	287,866	965	373	Pistoia	pistoiesi
Pordenone	p	IT.FV.PN	PN	33	ITH41	310,811	2,274	878	Pordenone	pordenonesi
Potenza	p	IT.BC.PZ	PZ	85	ITF51	377,935	6,551	2,529	Potenza	potentini
Prato	p	IT.TC.PO	PO	59	ITI15	245,916	366	141	Prato	pratesi
Ragusa	p	IT.SC.RG	RG	97	ITG18	307,492	1,614	623	Ragusa	ragusani
Ravenna	p	IT.ER.RA	RA	48	ITH57	384,761	1,859	718	Ravenna	ravennati
Reggio di Calabria	p	IT.LB.RC	RC	89	ITF65	550,967	3,185	1,230	Reggio di Calabria	reggini
Reggio nell'Emilia	p	IT.ER.RE	RE	42	ITH53	517,316	2,293	885	Reggio nell'Emilia	reggiani
Rieti	p	IT.LZ.RI	RI	02	ITI42	155,164	2,750	1,062	Rieti	reatini
Rimini	p	IT.ER.RN	RN	47	ITH59	321,769	534	206	Rimini	riminesi
Rome	m	IT.LZ.RM	RM	00	ITI43	3,997,465	5,353	2,067	Rome	romani
Rovigo	p	IT.VN.RO	RO	45	ITH37	242,349	1,791	691	Rovigo	rodigini
Salerno	p	IT.CM.SA	SA	84	ITF35	1,092,876	4,919	1,899	Salerno	salernitani
Sassari	p	IT.SD.SX	SS	07	ITG25	328,043	4,282	1,653	Sassari	sassaresi
Savona	p	IT.LG.SV	SV	17	ITC32	281,028	1,546	597	Savona	savonesi
Siena	p	IT.TC.SI	SI	53	ITI19	266,621	3,821	1,475	Siena	senesi
Sondrio	p	IT.LM.SO	SO	23	ITC44	180,814	3,212	1,240	Sondrio	sondriesi
Syracuse	p	IT.SC.SR	SR	96	ITG19	399,933	2,109	814	Syracuse	siracusani
Taranto	p	IT.PU.TA	TA	74	ITF43	584,649	2,437	941	Taranto	tarantini
Teramo	p	IT.AB.TE	TE	64	ITF12	306,349	1,949	752	Teramo	teramani
Terni	p	IT.UM.TR	TR	05	ITI22	228,424	2,123	820	Terni	ternani
Trapani	p	IT.SC.TP	TP	91	ITG11	429,917	2,461	950	Trapani	trapanesi
Trento	p	IT.TT.TN	TN	38	ITH20	524,832	6,209	2,397	Trento	trentini
Treviso	p	IT.VN.TV	TV	31	ITH34	876,790	2,477	956	Treviso	trevigiani
Trieste	p	IT.FV.TS	TS	34	ITH44	232,601	212	82	Trieste	triestini
Turin	m	IT.PM.TO	TO	10	ITC11	2,247,780	6,833	2,638	Turin	torinesi
Udine	p	IT.FV.UD	UD	33	ITH42	535,430	4,907	1,894	Udine	udinesi
Varese	p	IT.LM.VA	VA	21	ITC41	871,886	1,199	463	Varese	varesini
Venice	p	IT.VN.VE	VE	30	ITH35	846,962	2,462	951	Venice	veneziani
Verbano-Cusio-Ossola	p	IT.PM.VB	VB	28	ITC14	160,264	2,256	871	Verbania	verbanesi
Vercelli	p	IT.PM.VC	VC	13	ITC12	176,941	2,089	807	Vercelli	vercellesi
Verona	p	IT.VN.VR	VR	37	ITH31	900,542	3,121	1,205	Verona	veronesi
Vibo Valentia	p	IT.LB.VV	VV	88	ITF64	163,409	1,140	440	Vibo Valentia	vibonesi
Vicenza	p	IT.VN.VI	VI	36	ITH32	859,205	2,723	1,051	Vicenza	vicentini
Viterbo	p	IT.LZ.VT	VT	01	ITI41	312,864	3,613	1,395	Viterbo	viterbesi
110 divisions					59,433,744	301,252	116,319
Province: Names are given in their common English form, where that differs from the Italian. Typ: province, metropolitan city, or region. HASC: Hierarchical administrative subdivision codes. ISO: Codes from ISO 3166-2 (see note below). CAP: Codici di Avviamento Postale (postal codes). Italy has a system of five-digit postal codes. The first two digits are constant within each province. (In a few cases, two or more provinces use the same first two digits.) NUTS: Nomenclature of Territorial Units for Statistics, a European standard. The first four characters of the NUTS code for each province are the NUTS code for the region to which the province belongs. Population: 2011-10-09 census. Adjective: Masculine plural adjective for inhabitants of the provincial capital, or the province as a whole.

 

Note: ISO province codes as of 2010-02-03 are the same as sigle automobilistiche, except for that of Rome. Its sigla is ROMA. Sigle automobilistiche, or sigle de provenienza (vehicle codes, provenance codes) are used in Italy on license plates, maps, forms, etc. For more historical background, see source [5].

Territorial extent: 

1. Any province in Sardinia region lies mainly on the island of Sardinia, although it may include other nearby islands. The same is true of Sicily.
2. Agrigento includes the Pelagian Islands: Lampedusa, Linosa, and the tiny islet of Lampione.
3. Arezzo includes an exclave within Pesaro e Urbino, which consequently is also an exclave of Tuscany region within Marche. It's part of Badia Tedalda commune.
4. Benevento includes an exclave within Avellino, constituting the commune of Pannarano.
5. Cagliari includes the islands of Sant' Antíoco and San Pietro.
6. Caltanissetta includes an exclave within Palermo, constituting the commune of Resuttano.
7. Como includes a small exclave within the canton of Ticino, Switzerland, constituting the commune of Campione d'Italia.
8. Enna includes a tiny exclave within Caltanissetta.
9. Foggia includes the Tremiti islands: San Domino, San Nicola, Caprara, Pianosa, etc.
10. Gorizia includes islands in the Laguna di Grado, as far west as the inlet of Porto Buso.
11. Grosseto includes the islands of Giglio, Giannutri, and the Formiche di Grosseto.
12. Latina includes the islands of Ponza, Palmarola, Ventoténe, Zamone, and other nearby islands.
13. Livorno includes most of the Tuscan Archipelago, including the islands of Elba, Capraia, Montecristo, Pianosa, and Gorgona.
14. Matera includes an exclave within Potenza, part of Tricárico commune.
15. Messina includes the Aeolian (Lipari) Islands, of which the largest are Lipari, Salina, Vulcano, Stromboli, Filicudi, Alicudi, and Panarea.
16. Milan includes an exclave of Lentate sul Severo, surrounded by Como and Monza e Brianza.
17. Naples includes the islands of Ischia, Capri, Prócida, and other nearby islands.
18. Oristano includes the island of Mal di Ventre.
19. Palermo includes an exclave within Agrigento, part of Bisacquino commune.
20. Perugia includes an exclave within Pesaro e Urbino (which consequently is also an exclave of Umbria region within Marche), part of Città di Castello commune.
21. Rimini includes a tiny exclave within Pesaro e Urbino (and barely touching San Marino; consequently also an exclave of Emilia-Romagna region within Marche), part of Verucchio commune.
22. Sassari includes neighboring islands such as Asinara, Maddalena, Caprera, Spargi, Tavolara, Molara, Santo Stefano, Santa Maria, Rázzoli, and Budelli.
23. Terni includes an exclave on the border between Perugia and Siena, part of Fabro commune.
24. Trapani includes the islands of Pantelleria, Maréttimo, and the Égadi islands (Favignana, Lévanzo, etc.).
25. Udine includes islands in the Laguna di Marano, as far east as Santa Andrea.
26. Viterbo includes a small exclave on the border between Rieti and Terni, part of Gallese commune.

Origins of names: 

1. Alessandria: after Pope Alexander III
2. Ancona: Ancient Greek ankon: bent arms, for the shape of two promontories
3. Aosta: Latin Augusta prætoria Salassorum. It was a colony founded by emperor Augustus to house his pretorian guard, in the land of the Salassi.
4. Avellino: Latin Abellinum: pertaining to Abella, a city in Campania
5. Bari: possibly from Ancient Greek baris: fortified house
6. Benevento: named Maleventum prior to 268 B.C., when it was changed to Beneventum (Latin bene: good, eventum: fortune); however, Maleventum probably came from mal: height, not malus: bad
7. Bolzano: possibly from Bautianum: Bautius's plantation
8. Brindisi: brention: stag's head
9. Cagliari: Greek Karalis, from pre-Indo-European kar: rock
10. Caltanissetta: diminutive of Caltanissa, said to be from Arabic Kal`at: castle, an-Nisa': of women
11. Campobasso: Italian for low field
12. Caserta: Italian casa: house, erta: elevated, for a castle overlooking it
13. Crotone: possibly from Ancient Greek kroton: castor-oil plant
14. Cuneo: Latin cuneus: corner (between the Gesso and Stura Rivers)
15. Ferrara: probably Latin ferraria: iron smithy
16. Florence: from Latin Florentia: flowering place
17. Foggia: Italian dialect for ditch
18. Forlì: Latin forum Livii: city of Livius (Roman consul Marcus Livius Salinator)
19. Gorizia: Slovenian Gorica: little mountain
20. Grosseto: possibly place of the grossi (type of fig trees)
21. Imperia: after the river Impero; created in 1923 by the union of Porto Maurizio and Oneglia
22. L'Aquila: Italian for "the eagle"
23. Latina: renamed from Littoria in 1945 to avoid Fascist overtones; located in northern Latium
24. Lodi: Latin Laude Pompeia: mention of Pompey, after Cneius Pompeius Strabo
25. Macerata: Latin for pisé, or rammed earth, because that method of construction was used
26. Messina: after the Greek region of Messinia, because of colonists from there
27. Milan: Gallic medio: middle, lanon: inhabited place, through Latin Mediolanum
28. Modena: possibly from Etruscan mutna: tomb
29. Naples: Ancient Greek nea: new, polis: city
30. Padua: probably from Padus, the Latin name of the Po River
31. Palermo: Ancient Greek pan: all, hormos: anchorage (i.e. good harbor)
32. Pescara: Medieval Latin piscaria: fish market
33. Piacenza: Latin placentia: pleasure
34. Pisa: possibly pre-Indo-European pisa: wetland
35. Pistoia: from Latin pistor: grinder of grain
36. Ravenna: possibly pre-Indo-European rava: torrent
37. Syracuse: named for a swamp
38. Trapani: Ancient Greek drepanon: scythe, for the shape of a promontory
39. Trieste: probably from an Indo-European root meaning market
40. Turin: Latin Augusta Taurinorum, from the ethnic name Taurini
41. Venetia, Venice: land of the Veneti (ethnic name)

Change history: 

The 1911 edition of the Encyclopædia Britannica said, "The kingdom is divided into 69 provinces, 284 regions, of which 197 are classed as circondarii and 87 as districts (the latter belonging to the province of Mantua and the 8 provinces of Venetia), 1806 administrative divisions (mandamenti) and 8262 communes. These were the figures at the date of the census. [Most likely this refers to the 1901 census.] In 1906 there were 1805 mandamenti and 8290 communes, and 4 boroughs in Sardinia not connected with communes." The following table is taken from the same source, although it only shows 68 provinces.

Province	Pop-1881	Pop-1901	Area(mi.²)	Region
Alessandria	729,710	825,745	1,950	Piedmont
Ancona	267,338	308,346	762	Marches
Aquila degli Abruzzi	353,027	436,367	2,484	Abruzzi and Molise
Arezzo	238,744	275,588	1,273	Tuscany
Ascoli Piceno	209,185	251,829	796	Marches
Avellino	392,619	421,766	1,172	Campania
Bari delle Puglie	679,499	837,683	2,065	Apulia
Belluno	174,140	214,803	1,293	Venetia
Benevento	238,425	265,460	818	Campania
Bergamo	390,775	467,549	1,098	Lombardy
Bologna	464,879	529,619	1,448	Emilia
Brescia	471,568	541,765	1,845	Lombardy
Cagliari	420,635	486,767	5,204	Sardinia
Caltanisetta	266,379	329,449	1,263	Sicily
Campobasso	365,434	389,976	1,691	Abruzzi and Molise
Caserta	714,131	805,345	2,033	Campania
Catania	563,457	703,598	1,917	Sicily
Catanzaro	433,975	498,791	2,030	Calabria
Chieti	343,948	387,604	1,138	Abruzzi and Molise
Cosenza	451,185	503,329	2,568	Calabria
Cremona	302,097	3,594,304	1,695	Lombardy
Cuneo	635,400	670,504	2,882	Piedmont
Ferrara	230,807	270,558	1,012	Emilia
Florence	790,776	945,324	2,265	Tuscany
Foggia	356,267	421,115	2,688	Apulia
Forli	251,110	283,996	725	Emilia
Genoa	760,122	931,156	1,582	Liguria
Girgenti	312,487	380,666	1,172	Sicily
Grosseto	114,295	137,795	1,738	Tuscany
Lecce	553,298	705,382	2,623	Apulia
Leghorn	121,612	121,137	133	Tuscany
Lucca	284,484	329,986	558	Tuscany
Macerata	239,713	269,505	1,087	Marches
Mantua	295,728	315,448	912	Lombardy
Massa and Carrara	169,469	202,749	687	Tuscany
Messina	460,924	550,895	1,246	Sicily
Milan	1,114,991	1,450,214	1,223	Lombardy
Modena	279,254	323,598	987	Emilia
Naples	1,001,245	1,141,788	350	Campania
Novara	675,926	763,830	2,553	Piedmont
Padua	397,762	444,360	823	Venetia
Palermo	699,151	796,151	1,948	Sicily
Parma	267,306	303,694	1,250	Emilia
Pavia	469,831	504,382	1,290	Lombardy
Perugia	572,060	675,352	3,748	Umbria
Pesaro and Urbino	223,043	259,083	1,118	Marches
Piacenza	226,758	250,491	954	Emilia
Pisa	283,563	319,854	1,179	Tuscany
Porto Maurizio	132,251	144,604	455	Liguria
Potenza	524,504	491,558	3,845	Basilicata
Ravenna	218,359	234,656	715	Emilia
Reggio	244,959	281,085	876	Emilia
Reggio di Calabria	372,723	437,209	1,221	Calabria
Rome	903,472	1,142,526	4,663	Lazio
Rovigo	217,700	222,057	685	Venetia
Salerno	550,157	585,132	1,916	Campania
Sassari	261,367	309,026	4,090	Sardinia
Siena	205,926	233,874	1,471	Tuscany
Sondrio	120,534	130,966	1,232	Lombardy
Syracuse	341,526	433,796	1,442	Sicily
Teramo	254,806	312,188	1,067	Abruzzi and Molise
Trapani	283,977	373,569	948	Sicily
Treviso	375,704	416,945	960	Venetia
Turin	1,029,214	1,147,414	3,955	Piedmont
Udine	501,745	614,720	2,541	Venetia
Venice	356,708	399,823	934	Venetia
Verona	394,065	427,018	1,188	Venetia
Vicenza	396,349	453,621	1,052	Venetia
68 provinces	28,459,628	32,965,504	110,623
Pop-1881: 1881-12-31 census. Pop-1901: 1901-02-10 census. Region: Region to which the province belonged.

 

Note: the figures given in the source are consistent, with a few exceptions. The figures for Lombardy don't add up right. Specifically, the total of the areas of the provinces of Lombardy falls short of the correct area for the whole region by 91 mi.². The 1881 populations of the individual provinces fall short of the regional total by 515,050. The 1901 populations exceed the regional total by 2,670,529. Part of that discrepancy must be due to Cremona, which is unlikely to have grown almost twelve-fold in two decades. There's one other problem: the total of the populations by region for 1901 is 32,965,954, which is 450 more than the reported total.

1. 1920-07-16: Treaty of Saint-Germain took effect. Territory was transferred from several provinces of the Austro-Hungarian Empire to Italy. The southern part of Tyrol province (about half) and a small part of Carinthia became Venezia Tridentina region, consisting of Trento province. Most of Coastland (Küstenland) province and the enclave of Zara in Dalmatia were annexed to Venezia region, becoming the provinces of Gorizia, Pola, and Trieste.
2. 1920-11-12: Treaty of Rapallo signed, by which Fiume (Rijeka) became a free state, and Italy received two groups of Adriatic islands: in the north, Cherso (Cres), Lussin (Lošinj), and some smaller islands; in the south, Lagosta (Lastovo), Pelagosa (Palagruža), and others.
3. 1923: Name of city and province of Porto Maurizio changed to Imperia. Name of Udine province, but not its capital, changed to Friuli.
4. 1924-01-27: City of Fiume, and most of the Free State, annexed to Italy by treaty with Yugoslavia, becoming the province of Fiume in the region of Venezia.
5. 1927: Nuoro province formed from parts of Cagliari and Sassari. Pistoia province split from Florence. Name of city and province of Girgenti changed to Agrigento. Name of city and province of Castrogiovanni changed to Enna.
6. ~1927: Aosta province split from Turin. Bolzano province split from Trento. Brindisi and Taranto provinces split from Lecce. Castrogiovanni province formed from parts of Caltanissetta and Catania. Frosinone and Viterbo provinces split from Rome. La Spezia and Savona provinces split from Genoa. Matera province split from Potenza. Pescara province formed from parts of Chieti and Teramo. Ragusa province split from Syracuse. Rieti and Terni provinces split from Perugia; Rieti province transferred from Umbria region to Lazio. Varese province split from Como. Vercelli province split from Novara.
7. 1934: Littoria province split from Rome.
8. ~1937: Name of Taranto province, but not its capital, changed to Ionio.
9. 1937: Name of Pola province, but not its capital, changed to Istria.
10. 1938: Name of Massa-Carrara province, and its capital Massa, changed to Apuania.
11. ~1939: Asti province split from Alessandria. Name of Fiume province, but not its capital, changed to Carnaro.
12. ~1945: Massa city, Massa-Carrara, Taranto, and Udine provinces restored to their pre-war names. Name of Littoria city and province changed to Latina.
13. 1945-09-07: Province of Valle d'Aosta abolished, and its powers transferred to the regional government.
14. 1954-10-25: Zone A of Free Territory of Trieste annexed to Italy as the province of Trieste.
15. ~1969: Pordenone province split from Udine.
16. 1974-07-16: Oristano province formed from parts of Cagliari and Nuoro.
17. ~1979: Isernia province split from Campobasso.
18. 1992-03-06: Biella province split from Vercelli.
19. 1992-03-27: Prato province split from Florence.
20. 1996-01-01: New provinces created: Crotone and Vibo Valentia split from Catanzaro; Lecco formed from part of Como and smaller part of Bergamo; Lodi split from Milan; Rimini split from Forlì; Verbania split from Novara. Several of these had previously been circondari.
21. 1999: Sigla of Pesaro e Urbino province changed from PS to PU.
22. ~2000: Name of Forlì province changed to Forlì-Cesena, and its sigla changed from FO to FC; name of Verbania province changed to Verbano-Cusio-Ossola.
23. 2001-07-12: Law passed, creating four new provinces in Sardinia region. Carbonia-Iglesias and Medio Campidano provinces split from Cagliari (former HASC code IT.CA). Ogliastra split from Nuoro (IT.NU). Olbia-Tempio formed from parts of Nuoro and Sassari (IT.SS). Parts of Nuoro transferred to Cagliari and Oristano (IT.OR). The new provinces became active following the elections of 2005-05-22 to 23. In earlier plans, Olbia-Tempio would have been named Gallura, and Carbonia-Iglesias would have been Sulcis-Iglesiente. Source [4] has a map of the changes.
24. 2004-06-11: Three new provinces created. In Apulia region, Barletta-Andria-Trani was formed from parts of Bari (former HASC code IT.BA; 2001 population, 1,559,662; area, 5,139 km.²) and Foggia (IT.FG, 690,992, 7,192). In Marche, Fermo was split from Ascoli-Piceno (IT.AP, 369,371, 2,089). In the Lombardy region, Monza e Brianza was split from Milan (IT.MI, 3,707,210, 1,985). Their creation was approved by the Chamber of Deputies on 2003-10-29; passed by the Senate on 2004-05-19 (2004-05-12 in the case of Monza e Brianza); signed by the President on 2004-06-11; and published in the Official Gazette on 2004-06-15. Barletta-Andria-Trani became active on 2009-06-08; Fermo on 2009-06-22; and Monza e Brianza on 2009-06-07.
25. 2006-12: Sigla of Medio Campidano changed from the provisional MD to VS.
26. 2009-08: Seven communes transferred from Pesaro e Urbino province to Rimini, and thus from Marche region to Emilia-Romagna: Casteldelci, Maiolo, Novafeltria, Pennabilli, San Leo, Sant'Agata Feltria, and Talamello.
27. 2009-12-18: Five communes transferred from Milan province to Monza e Brianza: Busnago, Caponago, Cornate d'Adda, Lentate sul Seveso, and Roncello.
28. 2015-01-01: Status of Bari, Bologna, Florence, Genoa, Milan, Naples, Rome, and Turin changed from provinces to metropolitan cities.

Other names of subdivisions:

1. Agrigento: Agrigente (French); Girgenti (obsolete)
2. Alessandria: Alejandría (Spanish); Alexandrie (French)
3. Ancona: Ancône (French)
4. Aosta: Aoste (French); Val d'Aosta, Valle d'Aosta (variant)
5. Barletta-Andria-Trani: provincia dell'Ofanto (Italian-informal)
6. Benevento: Bénévent (French)
7. Bergamo: Bergame (French)
8. Bologna: Bologne (French); Bolonha (Portuguese); Bolonia (Spanish)
9. Bolzano: Bozen, Südtirol (German)
10. Caserta: Caserte (French)
11. Catania: Catane (French)
12. Como: Côme (French)
13. Cremona: Crémone (French)
14. Cuneo: Coni (French)
15. Ferrara: Ferrare (French)
16. Florence: Firenze (Italian); Florença (Portuguese); Florencia (Spanish); Florens (Swedish); Florenz (German)
17. Foggia: Capitanata (obsolete)
18. Forli: Forlì (Italian)
19. Genoa: Gênes (French); Genova (Italian); Gênova (Portuguese); Génova (Spanish); Genua (Dutch, German, Swedish)
20. Gorizia: Görz (German)
21. Imperia: Porto Maurizio (obsolete)
22. L'Aquila: Aquila (variant)
23. La Spezia: Spezia (variant)
24. Latina: Littoria (obsolete)
25. Livorno: Leghorn (obsolete); Liorna (Spanish); Livourne (French)
26. Lucca: Lucques (French)
27. Mantua: Mantoue (French); Mantova (Italian, Spanish, Swedish)
28. Massa-Carrara: Apuania (obsolete); Massa-Carrare (French); Massa e Carrara (variant)
29. Messina: Messine (French)
30. Milan: Mailand (German); Milaan (Dutch); Milán (Spanish); Milano (Italian, Swedish); Milão (Portuguese)
31. Modena: Modène (French); Módena (Spanish)
32. Monza e Brianza: Monza e della Brianza (variant)
33. Naples: Napels (Dutch); Nápoles (Portuguese, Spanish); Napoli (Italian); Neapel (German, Swedish)
34. Novara: Novare (French)
35. Padua: Padoue (French); Padova (Italian, Swedish)
36. Palermo: Palerme (French)
37. Parma: Parme (French)
38. Pavia: Pavie (French)
39. Perugia: Pérouse (French); Perúgia (Portuguese)
40. Pesaro e Urbino: Pesaro-et-Urbino (French); Pesaro-Urbino (variant); Pésaro y Urbino (Spanish)
41. Piacenza: Plaisance (French)
42. Pisa: Pise (French)
43. Ragusa: Raguse (French)
44. Ravenna: Rávena (Spanish); Ravenne (French)
45. Reggio di Calabria: Reggio Calabria (variant); Reggio de Calabre (French)
46. Reggio nell'Emilia: Reggio d'Émilie (French)
47. Rome: Rom (Danish, German, Swedish); Roma (Italian, Portuguese, Spanish); Rooma (Finnish); Рим (Russian)
48. Salerno: Salerne (French)
49. Siena: Sienne (French)
50. Syracuse: Siracusa (Italian, Spanish, Swedish); Syrakus (German)
51. Taranto: Ionio (obsolete); Tarent (German); Tarente (French)
52. Trento: Trente (French); Trient (German)
53. Treviso: Trévise (French)
54. Trieste: Triest (German)
55. Turin: Torino (Italian); Turijn (Dutch); Turim (Portuguese)
56. Udine: Friuli (obsolete)
57. Venice: Venecia (Spanish); Venedig (German, Swedish); Venetsia (Finnish); Veneza (Portuguese); Venezia (Italian); Venise (French); Венеция (Russian)
58. Verbano-Cusio-Ossola: Verbania (variant)
59. Vercelli: Verceil (French)
60. Verona: Vérone (French)
61. Vicenza: Vicence (French)
62. Viterbo: Viterbe (French)