Because of the split of Mymensingh from Dhaka division, I changed the middle section of some HASC codes to reflect the current hierarchy.

When ISO 3166-2 first came out in 1998, it listed five divisions, 21 regions, and 64 districts in Bangladesh, specifying which region each district belonged to and which division each region belonged to. The second update to the standard (Newsletter Number I-2) was published on 2002-05-21. It listed only the divisions (now six in number) and the districts. It also changed the spelling of Kishorganj to Kishoreganj. This seems to be correct, so I have made the same change in the table below.

When the FIPS standard first came out in 1970, Bangladesh was listed with no subdivisions. By 1984, it was shown divided into 20 regions. In 1991, the listing changed to show 64 districts - the same districts that are listed in ISO 3166-2. Most recently, Change Notice 1 to FIPS 10-4, dated 1998-12-01, shows nothing but the four divisions (which were already outdated).

Bangladesh is divided into seven bibhag (divisions), which are subdivided into anchal (regions), which are further divided into zila (districts), and then into thana or upazila (subdistricts). The regions seem to be diminishing in importance. Therefore, I am presenting the districts as the secondary subdivisions of Bangladesh.

District	HASC	ISO	FIPS	Reg	PC	Population	Area(km.²)
Bagerhat	BD.KH.BH	05	BG22	4L	93	1,476,090	3,959
Bandarban	BD.CG.BD	01	BG04	2A	46	388,335	4,479
Barguna	BD.BA.BG	02	BG25	1Q	87	892,781	1,831
Barisal	BD.BA.BS	06	BG01	1B	82	2,324,310	2,785
Bhola	BD.BA.BL	07	BG23	1B	83	1,776,795	3,403
Bogra	BD.RS.BO	03	BG24	5C	58	3,400,874	2,899
Brahmanbaria	BD.CG.BB	04	BG26	2F	34	2,840,498	1,881
Chandpur	BD.CG.CP	09	BG27	2F	36	2,416,018	1,645
Chittagong	BD.CG.CT	10	BG29	2D	40	7,616,352	5,283
Chuadanga	BD.KH.CD	12	BG30	4M	72	1,129,015	1,174
Comilla	BD.CG.CM	08	BG05	2F	35	5,387,288	3,146
Cox's Bazar	BD.CG.CB	11	BG31	2D	47	2,289,990	2,492
Dhaka	BD.DH.DH	13	BG32	3G	10	12,043,977	1,464
Dinajpur	BD.RP.DJ	14	BG33	5H	52	2,990,128	3,444
Faridpur	BD.DH.FR	15	BG34	3I	78	1,912,969	2,053
Feni	BD.CG.FN	16	BG35	2O	39	1,437,371	990
Gaibandha	BD.RP.GB	19	BG36	5S	57	2,379,255	2,115
Gazipur	BD.DH.GZ	18	BG37	3G	17	3,403,912	1,806
Gopalganj	BD.DH.GG	17	BG38	3I	80	1,172,415	1,469
Habiganj	BD.SY.HA	20	BG39	2T	33	2,089,001	2,637
Jaipurhat	BD.RS.JP	24	BG40	5C	59	913,768	1,012
Jamalpur	BD.MM.JM	21	BG41	3J	20	2,292,674	2,115
Jessore	BD.KH.JS	22	BG42	4K	74	2,764,547	2,607
Jhalakati	BD.BA.JK	25	BG43	1B	84	682,669	707
Jhenaidah	BD.KH.JN	23	BG44	4K	73	1,771,304	1,965
Khagrachari	BD.CG.KG	29	BG45	2E	44	613,917	2,749
Khulna	BD.KH.KL	27	BG46	4L	90	2,318,527	4,394
Kishoreganj	BD.DH.KS	26	BG47	3N	23	2,911,907	2,689
Kurigram	BD.RP.KR	28	BG48	5S	56	2,069,273	2,245
Kushtia	BD.KH.KU	30	BG49	4M	70	1,946,838	1,609
Lakshmipur	BD.CG.LK	31	BG50	2O	37	1,729,188	1,440
Lalmonirhat	BD.RP.LL	32	BG51	5S	55	1,256,099	1,247
Madaripur	BD.DH.MD	36	BG52	3I	79	1,165,952	1,126
Magura	BD.KH.MG	37	BG53	4K	76	918,419	1,039
Manikganj	BD.DH.MK	33	BG54	3G	18	1,392,867	1,384
Meherpur	BD.KH.ME	39	BG55	4M	71	655,392	752
Moulvibazar	BD.SY.MB	38	BG56	2T	32	1,919,062	2,799
Munshiganj	BD.DH.MU	35	BG57	3G	13	1,445,660	1,004
Mymensingh	BD.MM.MM	34	BG12	3N	22	5,110,272	4,395
Naogaon	BD.RS.NA	48	BG58	5R	65	2,600,157	3,436
Narail	BD.KH.NR	43	BG59	4K	75	721,668	968
Narayanganj	BD.DH.NY	40	BG60	3G	14	2,948,217	684
Narsingdi	BD.DH.NS	42	BG61	3G	16	2,224,944	1,150
Natore	BD.RS.NT	44	BG62	5R	64	1,706,673	1,900
Nawabganj	BD.RS.NW	45	BG28	5R	63	1,647,521	1,703
Netrakona	BD.MM.NK	41	BG63	3N	24	2,229,642	2,794
Nilphamari	BD.RP.NP	46	BG64	5S	53	1,834,231	1,547
Noakhali	BD.CG.NO	47	BG13	2O	38	3,108,083	3,686
Pabna	BD.RS.PB	49	BG65	5P	66	2,523,179	2,376
Panchagarh	BD.RP.PN	52	BG66	5H	50	987,644	1,405
Parbattya Chattagram	BD.CG.PC	56	BG67	2E	45	595,979	6,116
Patuakhali	BD.BA.PT	51	BG15	1Q	86	1,535,854	3,221
Pirojpur	BD.BA.PR	50	BG68	1B	85	1,113,257	1,278
Rajbari	BD.DH.RB	53	BG69	3I	77	1,049,778	1,092
Rajshahi	BD.RS.RS	54	BG70	5R	60	2,595,197	2,425
Rangpur	BD.RP.RP	55	BG71	5S	54	2,881,086	2,401
Satkhira	BD.KH.ST	58	BG72	4L	94	1,985,959	3,817
Shariatpur	BD.DH.SA	62	BG73	3I	80	1,155,824	1,174
Sherpur	BD.MM.SP	57	BG74	3J	21	1,358,325	1,365
Sirajganj	BD.RS.SR	59	BG75	5P	67	3,097,489	2,402
Sunamganj	BD.SY.SN	61	BG76	2T	30	2,467,968	3,747
Sylhet	BD.SY.SL	60	BG77	2T	31	3,434,188	3,452
Tangail	BD.DH.TA	63	BG78	3U	19	3,605,083	3,414
Thakurgaon	BD.RP.TH	64	BG79	5H	51	1,390,042	1,782
HASC: Hierarchical administrative subdivision codes. The middle two letters identify the division. For key, see Divisions of Bangladesh page. ISO: Codes from ISO 3166-2. For full identification in a global context, prefix "BD-" to the code (ex: BD-57 represents Sherpur). FIPS: Codes from FIPS PUB 10-4. Reg: ISO code for region to which the district belongs (for key to codes, see table below). PC: First two digits of lowest postal code. Population: 2011-03-15 census (source [8]). Capitals: Capitals have the same name as their districts.

Postal codes:

Bangladesh uses a four-digit postal code. Most districts have a range of 100 postal codes, from xx00 to xx99. Some have more, and overlap with other districts.

Further subdivisions:

The regions of Bangladesh are listed in the following table. Khagrachari is included in Chittagong Hill Tracts, because that's the way the standards treated it. For a breakout of those two regions, simply use the district figures for Khagrachari and Parbattya Chattagram, respectively.

Region	ISO	FIPS	Population	Area(km.²)
Bandarban	2A	BG04	388,335	4,479
Barisal	1B	BG01	5,897,031	8,173
Bogra	5C	BG02	4,314,642	3,911
Chittagong	2D	BG03	9,906,342	7,775
Chittagong Hill Tracts	2E	BG21	1,209,896	8,865
Comilla	2F	BG05	10,643,804	6,673
Dhaka	3G	BG06	23,459,577	7,492
Dinajpur	5H	BG07	5,367,814	6,631
Faridpur	3I	BG08	6,456,938	6,914
Jamalpur	3J		3,650,999	3,480
Jessore	4K	BG09	6,175,938	6,579
Khulna	4L	BG10	5,780,576	12,171
Kushtia	4M	BG11	3,731,245	3,535
Mymensingh	3N	BG12	10,251,821	9,877
Noakhali	2O	BG13	6,274,642	6,117
Pabna	5P	BG14	5,620,668	4,778
Patuakhali	1Q	BG15	2,428,635	5,053
Rajshahi	5R	BG16	8,549,548	9,464
Rangpur	5S	BG17	10,419,944	9,554
Sylhet	2T	BG18	9,910,219	12,635
Tangail	3U	BG19	3,605,083	3,414
ISO: Codes from ISO 3166-2 (obsolete). FIPS: When FIPS PUB 10-3 came out, Jamalpur was part of Mymensingh. Population: 2011-03-15 census (calculated by adding the districts in each region). Capitals: All capitals have the same name as their region, except that Rangamati is the capital of Chittagong Hill Tracts.

 

The first version of ISO 3166-2 had region codes as shown above. Every region code except Sylhet's started with the digit representing the division to which the region belonged. Sylhet's code should have been 6T to conform with the pattern. ISO never changed it, and in 2002 the list of regions and their codes was dropped from the standard entirely. Since then, Rangpur region has split from Rajshahi, further altering the pattern of adherence.

Change history:

1. ~1946: Patuakhali district split from Bakerganj (now Barisal). Tangail district split from Mymensingh.
2. ~1959: Bandarban district split from Chittagong Hill Tracts.
3. ~1959: Jamalpur district split from Mymensingh. Jamalpur consisted of the western part of the former district of Nasirabad, not including the city of Mymensingh itself.
4. 1971-12-15: Bangladesh became independent. At that date, it had four bibhag (divisions), which were subdivided into zila (districts), and then into thana or upazila (subdistricts).
5. ~1972: Nasirabad and Quaidabad districts merged to form Mymensingh.
6. 1981: Khagrachhari district split from Chittagong Hill Tracts.
7. 1983: Name of Dacca district changed to Dhaka.
8. ~1985: Status of districts (zila) changed to regions (anchal). The regions were subdivided into 64 new, smaller districts, each of which was formed of a set of thana.
9. ~1993: Barisal division formed by taking Barisal and Patuakhali regions from Khulna.
10. ~1998: Sylhet division formed by taking Sylhet region from Chittagong.
11. 2010-01-25: Rangpur division formed by taking Dinajpur and Rangpur regions from Rajshahi.

Other names of subdivisions:

1. Bagerhat: Bagherhat (variant)
3. Bandarban: Bandarbon (variant)
4. Barguna: Borgona (variant)
5. Barisal: Bakerganj (obsolete); Barishal (variant)
7. Chittagong: Chattagram (Bengali); Chitagongue (Portuguese-variant)
8. Chittagong Hill Tracts: Parbattya Chattagram (Bengali); Rangamati (variant)
9. Chuadanga: Chaudanga, Choua Danga (variant)
10. Comilla: Commilla (variant)
11. Cox's Bazar: Cox Bazar (variant)
12. Dhaka: Daca (Portuguese); Dacca (obsolete)
13. Gaibandha: Gaibanda (variant)
14. Gopalganj: Gopalgonj (variant)
15. Habiganj: Hobiganj, Hobigonj (variant)
16. Jaipurhat: Joypurhat (variant)
17. Jhalakati: Jhalakhati, Jhalkathi, Jhalokathi, Jhalokati (variant)
18. Jhenaidah: Jhinaidah, Jhinaidha, Jinaidaha (variant)
20. Khagrachari: Khagrachhari, Ramgarh (variant)
21. Kishoreganj: Kishorganj, Kishorgonj (variant)
22. Kushtia: Kustia (variant)
23. Lakshmipur: Laksmipur, Laxmipur (variant)
24. Manikganj: Manikgonj (variant)
25. Meherpur: Maherpur (variant)
26. Moulvibazar: Maulvi Bazar, Moulabi Bazar, Moulavi Bazar, Moulovibazar (variant)
27. Munshiganj: Munshigonj (variant)
28. Mymensingh: Nasirabad (obsolete)
29. Naogaon: Noagaon (variant)
30. Narail: Narial (variant)
31. Narayanganj: Naray Angonj (variant)
32. Narsingdi: Narshingdi (variant)
33. Natore: Nador (Portuguese-variant); Nator (variant)
34. Nawabganj: Chapai Nababgonj, Chapai Nawabganj, Chapai Nowab Ganj, Chapinawabganj (variant)
36. Netrakona: Netrokona (variant)
37. Nilphamari: Nilphamary (variant)
38. Pabna: Pabhna (variant)
39. Panchagarh: Pabchagarh, Panchagar, Panchagor, Panchgarh (variant)
40. Parbattya Chattagram: Chittagong Hill Tracts (English); Rangamati (variant)
41. Rangpur: Rongpur (variant)
42. Satkhira: Shatkhira (variant)
43. Shariatpur: Sariatpur, Shariyatpur (variant)
44. Sirajganj: Sirajgonj (variant)
45. Sunamganj: Sun Amgonj (variant)
46. Thakurgaon: Thakoregaon (variant)

Population history:

Region	1901	1911	1921	1931	1941	1951-03-01	1961-02-01	1974-03-01	1981-03-06	1991-03-11	2001-01-23	2011-03-15
Bandarban								116,000	171,000	231,000	298,120	388,335
Barisal	2,484,878	2,612,806	2,843,914	3,194,455	3,810,974	2,635,797	3,068,121	3,928,000	4,667,000	5,413,000	5,864,383	5,897,031
Bogra	884,079	1,016,782	1,082,750	1,121,954	1,260,463	1,278,185	1,574,105	2,231,000	2,728,000	3,434,000	3,859,752	4,314,642
Chittagong	1,468,377	1,628,085	1,740,306	1,936,389	2,331,481	2,511,785	2,982,931	4,315,000	5,491,000	6,715,000	8,385,849	9,906,342
Comilla	2,138,664	2,454,744	2,695,702	3,056,300	3,860,139	3,792,200	4,388,906	5,819,000	6,881,000	8,207,000	9,265,040	10,643,804
Dhaka	2,617,340	2,929,389	3,171,524	3,449,293	4,223,532	4,072,781	5,095,745	7,612,000	10,014,000	13,232,000	17,192,103	23,459,577
Dinajpur	1,125,597	1,167,706	1,219,613	1,234,224	1,335,588	1,354,432	1,709,917	2,571,000	3,200,000	3,983,000	4,693,422	5,367,814
Faridpur	1,809,542	1,956,444	2,058,783	2,192,015	2,682,701	2,774,345	3,178,945	4,060,000	4,764,000	5,424,000	6,102,298	6,456,938
Jamalpur								2,059,000	2,452,000	3,013,000	3,386,751	3,650,999
Jessore	1,618,630	1,568,790	1,557,463	1,522,868	1,662,646	1,638,387	2,190,151	3,327,000	4,020,000	4,848,000	5,573,802	6,175,938
Khagrachari										343,000	525,664	613,917
Khulna	1,267,720	1,379,818	1,471,860	1,629,430	1,944,418	2,075,506	2,448,720	3,557,000	4,329,000	5,039,000	5,792,706	5,780,576
Kushtia	885,079	841,860	782,992	807,725	919,543	884,157	1,166,262	1,884,000	2,292,000	2,801,000	3,338,721	3,731,245
Mymensingh	3,922,247	4,530,881	4,842,467	5,135,264	6,029,533	4,557,939	5,532,318	5,508,000	6,568,000	7,994,000	9,072,868	10,251,821
Noakhali	1,027,785	1,183,789	1,347,902	1,567,368	2,039,217	2,071,144	2,383,145	3,234,000	3,816,000	4,626,000	5,307,529	6,274,642
Pabna	1,417,839	1,425,124	1,385,321	1,437,998	1,696,149	1,584,303	1,959,060	2,815,000	3,424,000	4,184,000	4,870,084	5,620,668
Patuakhali						1,006,388	1,193,648	1,499,000	1,843,000	2,050,000	2,309,335	2,428,635
Rajshahi	1,902,317	2,000,161	2,027,591	1,993,280	2,198,081	2,205,057	2,810,964	4,288,000	5,270,000	6,594,000	7,624,887	8,549,548
Rangamati	124,762	153,830	173,243	212,922	247,053	287,274	385,079	392,000	580,000	401,000	508,182	595,979
Rangpur	2,202,018	2,434,009	2,554,945	2,646,285	2,923,879	2,916,476	3,796,043	5,447,000	6,510,000	8,015,000	9,153,728	10,419,944
Sylhet	2,030,912	2,240,838	2,297,720	2,466,410	2,831,900	3,059,367	3,489,589	4,759,000	5,656,000	6,765,000	7,939,343	9,910,219
Tangail						1,226,806	1,486,588	2,078,000	2,444,000	3,003,000	3,290,696	3,605,083
Totals	28,927,786	31,555,056	33,254,096	35,604,170	41,997,297	41,932,329	50,840,325	71,479,000	87,120,000	106,315,000	124,355,263	144,043,697
Column headings are census dates. Where cells are empty, the change history (above) should explain why. Before 1974, data for Nasirabad and Quaidabad are combined and listed under Mymensingh.