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Updates: 

"Geopolitical Entities, Names, and Codes, Edition 2" (GENC), a U.S. standard that's supposed to correspond to ISO 3166-2, was issued on 2014-03-31. It has codes for the regions of Trinidad and Tobago. Like GEC, it has only one code for Tobago: TT-TOB. An update to ISO 3166-2, dated 2015-11-27, withdraws the ISO codes for Eastern and Western Tobago and replaces them with TT-TOB for Tobago. It also changes the code for Mayaro/Rio Claro from TT-RCM to TT-MRC. The GENC code has not changed to match it. Now that none of the standards show Eastern and Western Tobago separately, I conclude they should be combined.

"Geopolitical Entities and Codes" (GEC) is the successor to FIPS standard 10-4. Update 13 to GEC is dated 2013-09-30. For Trinidad and Tobago, all it does is correct one misspelling.

Update 7 to GEC was issued with the date 2012-02-01. It reflects the changes that have occurred in the country's subdivisions since 1980. It shows Tobago as a single division, though. It also changes the spelling of Port-of-Spain to Port of Spain.

International standard ISO 3166-2 was published on December 15, 1998. It superseded ISO/DIS 3166-2 (draft international standard). For Trinidad and Tobago, the draft standard showed eight counties, three municipalities, and one ward. The final standard shows eleven regions and five municipalities. Most of the codes are different, but the code "SGE" was Saint George in the old scheme and Sangre Grande in the new one. The change in the standard corresponds to an actual change in the administrative division of Trinidad and Tobago.

Country overview: 

Short name	TRINIDAD AND TOBAGO
ISO code	TT
FIPS code	TD
Language	English (en)
Time zone	-4
Capital	Port of Spain

 

Trinidad and Tobago was a British colony for the first part of the 20th century. On 1962-08-31 it became an independent member of the British Commonwealth.

Other names of country: 

1. Danish: Trinidad og Tobago, Republikken Trinidad og Tobago (formal)
2. Dutch: Trinidad en Tobago, Republiek Trinidad en Tobago (formal)
3. English: Republic of Trinidad and Tobago (formal)
4. Finnish: Trinidad ja Tobago
5. French: Trinité-et-Tobago f
6. German: Trinidad und Tobago n
7. Icelandic: Trínidad og Tóbagó
8. Italian: Trinidad e Tobago
9. Norwegian: Trinidad og Tobago, Republikken Trinidad og Tobago (formal)
10. Portuguese: Trindade e Tobago, Trinidad f e Tobago m (Brazil), Trinidade e Tobago (Brazil), República f de Trindade e Tobago (formal)
11. Russian: Республика Тринидад и Тобаго (formal)
12. Spanish: Trinidad y Tobago, Trinidad y Tabago, República f de Trinidad y Tobago (formal)
13. Swedish: Trinidad och Tobago
14. Turkish: Trinidad ve Tobago Cumhuriyeti (formal)

Origin of name: 

Spanish Trinidad: Trinity, named by Columbus on sighting three peaks; Carib tavaco: tobacco pipe

Primary subdivisions: 

Trinidad and Tobago is divided into nine regions, three boroughs, two cities, and one ward.

Name	Type	HASC	ISO	FIPS	Pop-2011	Pop-2000	Area(km.²)	Area(mi.²)	Capital	Former
Arima	bor	TT.AR	ARI	TD01	33,606	28,310	11	4	Arima	Arima
Chaguanas	bor	TT.CH	CHA	TD13	83,516	61,897	60	23	Chaguanas	Caroni
Couva/Tabaquite/Talparo	reg	TT.CT	CTT	TD14	178,410	152,483	720	278	Couva	Caroni, Saint George, Victoria
Diego Martin	reg	TT.DM	DMN	TD15	102,957	86,805	128	49	Petit Valley	Saint George
Mayaro/Rio Claro	reg	TT.MR	MRC	TD16	35,650	30,298	853	329	Rio Claro	Mayaro, Nariva
Penal/Debe	reg	TT.PD	PED	TD17	89,392	77,756	247	95	Penal	Saint Patrick, Victoria
Point Fortin	bor	TT.PF	PTF	TD18	20,235	17,755	24	9	Point Fortin	Point Fortin
Port of Spain	cit	TT.PS	POS	TD05	37,074	37,965	13	5	Port of Spain	Port of Spain
Princes Town	reg	TT.PT	PRT	TD19	102,375	85,682	621	240	Princes Town	Victoria
San Fernando	cit	TT.SF	SFO	TD10	48,838	48,784	19	7	San Fernando	San Fernando
Sangre Grande	reg	TT.SN	SGE	TD21	75,766	58,311	899	347	Sangre Grande	Saint Andrew, Saint David
San Juan/Laventille	reg	TT.SL	SJL	TD20	157,258	136,759	220	85	Laventille	Saint George
Siparia	reg	TT.SI	SIP	TD22	86,949	77,010	510	197	Siparia	Saint Patrick
Tobago	wd	TT.TO	TOB	TD11	60,874	44,190	303	117	Scarborough	Tobago
Tunapuna/Piarco	reg	TT.TP	TUP	TD23	215,119	170,767	527	204	Tunapuna	Saint George
15 divisions					1,328,019	1,114,772	5,155	1,989
Type: regions (reg), boroughs (bor), cities (cit), ward (wd). HASC: Hierarchical administrative subdivision codes. ISO: Region codes from ISO 3166-2. For full identification in a global context, prefix "TT-" to the code (ex: TT-SIP represents Siparia). FIPS: Codes from FIPS PUB 10-4. Pop-2011: 2011-01-09 census (source [5]). Pop-2000: 2000-05-15 census (source [2]). Area: 2000-05-15 census. Former: Pre-1990 divisions corresponding roughly to the territory of the modern division.

 

Note: the census data subdivide Tobago, not into Eastern and Western regions, but into seven parishes. Eastern Tobago includes the parishes of Saint George (2011 population: 6,875), Saint John (2,825), Saint Mary (3,297), and Saint Paul (6,048). Western Tobago includes Saint Andrew (17,536), Saint David (8,733), and Saint Patrick (15,560).

Postal codes: 

According to this TTPOST  page, Trinidad and Tobago launched a six-digit postal code scheme on 2012-03-28. The numbers are not yet available online. The first two digits of the code identify the main post office for processing deliveries. For example, Diego Martin's post office handles codes beginning with 12.

Territorial extent: 

1. Tobago consists of the islands of Tobago, Little Tobago, and Saint Giles' Islands.
2. The other divisions lie mainly on the island of Trinidad. In addition, Saint George includes the islands of Monos, Chacachacare, Gaspar Grande, and Huevos.

The UN LOCODE page  for Trinidad and Tobago lists locations in the country, some of them with their latitudes and longitudes, some with their ISO 3166-2 codes for their subdivisions. This information can be put together to approximate the territorial extent of subdivisions.

Change history: 

1. In 1900, Trinidad and Tobago was a British colony.
2. 1945-06: County councils were established. Counties were Caroni, Mayaro, Nariva, Saint Andrew, Saint David, Saint George, Saint Patrick, Tobago, and Victoria. In addition, the borough of Arima and the cities of Port of Spain and San Fernando were independent of any county.
3. 1962-08-31: Trinidad and Tobago became an independent member of the British Commonwealth.
4. 1980: Tobago House of Assembly was formed as the organ of local government for Tobago. Status of Tobago changed to ward.
5. 1980-04-30: Point Fortin municipality split from Saint Patrick county. The resulting divisions were as shown in this table.

County	HASC	ISO	FIPS	Typ	Pop-46	Pop-70	Pop-87	Area(km.²)	Area(mi.²)	Capital
Arima	TT.AR	ARI	TD01	mu	8,069	11,636	28,500	10	4	Arima
Caroni	TT.CA	CAR	TD02	cn	61,739	115,254	167,300	554	214	Chaguanas
Mayaro	TT.MA	MAY	TD03	cn	4,196	7,448	33,200	378	146	Rio Claro, Nariva
Nariva	TT.NA	NAR	TD04	cn	11,815	20,902		534	206	Rio Claro
Point Fortin	TT.PF	PTF		mu			17,300			Point Fortin
Port of Spain	TT.PS	POS	TD05	mu	92,793	62,680	58,300	6	3	Port-of-Spain
Saint Andrew	TT.SA	SAN	TD06	cn	23,285	39,071	57,800	733	283	Sangre Grande
Saint David	TT.SD	SDA	TD07	cn	5,037	6,009		205	79	Sangre Grande, Saint Andrew
Saint George	TT.SG	SGE	TD08	cn	138,362	312,085	435,800	917	354	Tunapuna
Saint Patrick	TT.SP	SPA	TD09	cn	69,183	117,189	122,800	676	261	Siparia
San Fernando	TT.SF	SFO	TD10	mu	28,842	36,879	33,100	2	1	San Fernando
Tobago	TT.TO	TOB	TD11	wd	27,208	38,754	44,300	300	116	Scarborough
Victoria	TT.VI	VIC	TD12	cn	87,441	163,164	218,700	813	314	Princes Town
13 divisions					557,970	931,071	1,217,100	5,128	1,981
Typ: county (cn), municipality (mu), or ward (wd). HASC: Hierarchical administrative subdivision codes. ISO: Codes from ISO 3166-2. FIPS: Codes from FIPS PUB 10-4. Pop-46: 1946-04-09 census (source [1]). Pop-70: 1970-04-07 census (source [6]). Pop-87: 1987 estimate. The Central Statistics Office reports Mayaro and Nariva as a unit, and Saint Andrew and Saint David as another unit.

1. 1990: According to the Ministry of Local Government (source [3]), seven new boroughs or counties were created. I haven't been able to find any documentation on the resulting divisions. Could these be the seven parishes of Tobago?
2. 1991-10-01: Chaguanas municipality split from Caroni county.
3. 1992: Local government reorganized into the divisions shown in the table above. Note that the four counties named for saints were all on the island of Trinidad, and have disappeared, but there are now seven parishes named for saints, all on the island of Tobago, and the same four saints are still on the map.
4. ~2014: I can find no current mention of Tobago being divided into Eastern and Western regions. If they did exist, they must have merged. Their former data were, Eastern Tobago (HASC code TT.ET, ISO code ETO, FIPS code TD11, 2011 population 19,045. 2000 pop. 14,887, area 215 km.², capital Roxborough) and Western Tobago (TT.WT, WTO, TD11, 41,829, 29,303, 88, Scarborough).

Other names of subdivisions: 

1. Port of Spain: Port-of-Spain (variant); Puerto España (Spanish)
2. San Juan/Laventille: San Juan/Lavantille (variant)
3. Tobago: Tabago (Spanish)

Sources: 

1. [1] Demographic Yearbook , 7th Ed. Statistical Office of the United Nations, New York, 1955 (retrieved 2011-08-20).
2. [2] Trinidad and Tobago Central Statistical Office website, http://www.cso.gov.tt/census2000 (dead link, retrieved 2005-06-04).
3. [3] Ministry of Local Government website, http://www.molg.gov.tt/contents.htm (dead link, retrieved 1999-09-23).
4. [4] Profile of Local Government Corporations, http://www.nalis.gov.tt/agri/LupapCD/Table%20Profile%20Local%20Government.htm (dead link, retrieved 2003-02-18). Had area and population data "compiled by the Land Use Policy & Administration Project (LUPAP) from data supplied by CSO – Mapping Unit and Local Area Concept Plans (1999)".
5. [5] Trinidad and Tobago 2011 Population and Housing Census : Demographic Report. The Central Statistical Office, Port of Spain, 2012 (retrieved 2013-07-29).
6. [6] 1979 Demographic Yearbook , 31st Ed. Statistical Office, United Nations, New York, 1980 (retrieved 2011-12-28).