Senegal is divided into regions, which are subdivided into départements (departments). Most of the departments are further subdivided into arrondissements, and then into communes; some departments have no subdivisions.

I acquired areas and populations for the departments as of 2005 from several sources, but none of them were complete. I had to do some combining and shuffling. The data shown in the last table in the Change history section are my best approximation.

Several new departments were created in 2002-02-21. The table below shows the departments of Senegal at that time.

Department	HASC
Bakel	SN.TB.BK
Bambey	SN.DB.BB
Bignona	SN.ZG.BG
Birkilane	SN.KF.BR
Bounkiling	SN.SD.BL
Dagana	SN.ST.DG
Dakar	SN.DK.DK
Diourbel	SN.DB.DB
Fatick	SN.FK.FK
Foundiougne	SN.FK.FD
Gossas	SN.FK.GS
Goudiry	SN.TB.GY
Goudomp	SN.SD.GP
Guédiawaye	SN.DK.GD
Guinguinéo	SN.KC.GG
Kaffrine	SN.KF.KF
Kanel	SN.MT.KN
Kaolack	SN.KC.KL
Kébémer	SN.LG.KB
Kédougou	SN.KG.KG
Kolda	SN.KO.KD
Koumpentoum	SN.TB.KP
Koungheul	SN.KC.KU
Linguère	SN.LG.LN
Louga	SN.LG.LG
Malème Hodar	SN.KF.MH
Matam	SN.MT.MT
Mbacké	SN.DB.MK
Mbour	SN.TH.MR
Médina Yoro Foula	SN.KO.YF
Nioro du Rip	SN.KC.NR
Oussouye	SN.ZG.OU
Pikine	SN.DK.PK
Podor	SN.ST.PD
Ranérou Ferlo	SN.MT.RN
Rufisque	SN.DK.RF
Saint-Louis	SN.ST.SL
Salémata	SN.KG.SM
Saraya	SN.KG.SY
Sédhiou	SN.SD.SD
Tambacounda	SN.TB.TC
Thiès	SN.TH.TH
Tivaouane	SN.TH.TV
Vélingara	SN.KO.VL
Ziguinchor	SN.ZG.ZG
HASC: Hierarchical administrative subdivision codes. The middle two letters identify the region. For key, see Regions of Senegal page.

Change history:

1. 1962: Senegal was divided into seven regions, subdivided into 28 circles, further subdivided into 86 arrondissements.
2. 1972-1980: circles were progressively supplanted by departments. On 1972-02-01, Thiès region was reorganized into Mbour, Thiès, and Tivaouane departments. On 1974-02-09, Sine-Saloum region was reorganized into six departments. On 1976-06-26, Diourbel region was reorganized into two regions (Diourbel and Louga), each consisting of three departments. In 1978, Casamance region was reorganized into six departments. In 1980, Fleuve region was reorganized into three departments.
3. ~1984: Dakar region, formerly monodepartmental, was subdivided into Dakar, Pikine, and Rufisque departments. Also, some time between 1973 and 1995, an area of 298 km.² was transferred from Mbour to Thiès department.
4. The departments as of 2001 are listed in the following table. There is a map of the departments at this stage in the online book Population Dynamics of Senegal .

Department	HASC	Population	Area(km.²)
Bakel	SN.TC.BK	140,824	22,378
Bambey	SN.DB.BB	234,532	1,351
Bignona	SN.ZG.BG	178,020	5,295
Dagana	SN.SL.DG	355,422	6,087
Dakar	SN.DK.DK	822,830	83
Diourbel	SN.DB.DB	215,265	1,175
Fatick	SN.FK.FK	238,974	2,646
Foundiougne	SN.FK.FD	173,363	2,959
Gossas	SN.FK.GS	182,066	2,330
Kaffrine	SN.KL.KF	402,101	11,853
Kaolack	SN.KL.KL	376,693	1,880
Kébémer	SN.LG.KB	164,370	3,823
Kédougou	SN.TC.KG	74,746	16,896
Kolda	SN.KD.KD	234,202	8,284
Linguère	SN.LG.LN	168,073	19,716
Louga	SN.LG.LG	210,897	5,649
Matam	SN.SL.MT	263,373	25,093
Mbacké	SN.DB.MK	351,257	1,833
Mbour	SN.TH.MR	371,668	1,607
Nioro du Rip	SN.KL.NR	234,013	2,277
Oussouye	SN.ZG.OU	45,658	891
Pikine	SN.DK.PK	947,238	95
Podor	SN.SL.PD	162,101	12,947
Rufisque	SN.DK.RF	245,470	372
Sédhiou	SN.KD.SD	361,554	7,293
Tambacounda	SN.TC.TC	262,311	20,328
Thiès	SN.TH.TH	472,974	1,873
Tivaouane	SN.TH.TV	348,071	3,121
Vélingara	SN.KD.VL	154,539	5,434
Ziguinchor	SN.ZG.ZG	240,346	1,153
HASC: Hierarchical administrative subdivision codes. Population: 1996-12-31 estimate. Source for populations and areas is Trade Point Senegal, adjusted for consistency. Capitals: Have the same name as their departments.

1. 2002-02-21: Saint-Louis department split from Dagana; Matam department formed from parts of Linguère and former Matam department; the remainder of former Matam department split into Kanel and Ranérou Ferlo departments; Guédiawaye department split from Pikine. This table shows the departments that resulted.

Department	HASC	Population	Area(km.²)
Bakel	SN.TC.BK	215,680	22,378
Bambey	SN.DB.BB	252,532	1,351
Bignona	SN.ZG.BG	224,617	5,295
Dagana	SN.ST.DG	207,991	5,208
Dakar	SN.DK.DK	1,030,594	79
Diourbel	SN.DB.DB	220,221	1,175
Fatick	SN.FK.FK	267,756	2,646
Foundiougne	SN.FK.FD	224,659	2,959
Gossas	SN.FK.GS	159,946	2,330
Guédiawaye	SN.DK.GD	286,989	13
Kaffrine	SN.KL.KF	467,748	11,853
Kanel	SN.MT.KN	196,919	9,783
Kaolack	SN.KL.KL	382,784	1,880
Kébémer	SN.LG.KB	215,648	3,823
Kédougou	SN.TC.KG	111,207	16,896
Kolda	SN.KD.KD	306,591	8,284
Linguère	SN.LG.LN	214,883	19,716
Louga	SN.LG.LG	299,075	4,911
Matam	SN.MT.MT	233,179	12,700
Mbacké	SN.DB.MK	710,342	1,833
Mbour	SN.TH.MR	513,278	1,607
Nioro du Rip	SN.KL.NR	282,175	2,277
Oussouye	SN.ZG.OU	36,506	891
Pikine	SN.DK.PK	834,246	87
Podor	SN.ST.PD	329,379	12,947
Ranérou Ferlo	SN.MT.RN	48,475	2,600
Rufisque	SN.DK.RF	307,463	372
Saint-Louis	SN.ST.SL	226,977	879
Sédhiou	SN.KD.SD	399,365	7,293
Tambacounda	SN.TC.TC	342,204	20,328
Thiès	SN.TH.TH	529,261	1,873
Tivaouane	SN.TH.TV	342,519	3,121
Vélingara	SN.KD.VL	206,547	5,434
Ziguinchor	SN.ZG.ZG	192,325	1,153
HASC: Hierarchical administrative subdivision codes. The middle two letters identify the region. For key, see Regions of Senegal page. Population: 2005 estimate. Capital: Capitals have the same names as their departments, except that Ranérou is the capital of Ranérou Ferlo.

1. 2006: Koungheul arrondissement removed from Kaffrine to become a new department.
2. 2008-02-01: Ten new departments formed in the process of creating three new regions.

Other names of subdivisions:

1. Mbacké: M'Backé (variant)
2. Mbour: M'Bour (variant)
3. Nioro du Rip: Nioro (variant)