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English: Labelled map of Royal Mail postcode districts of the BT postcode area. Indicative postcode district labels shown in red, post town labels shown in grey. Equirectangular projection with latitude stretching 170%, WGS84 datum. Geographic limits: Main 1:709,000 map: West: 8.253W; East: 5.363W; North: 55.349N; South: 53.989N
The BT postcode area, also known as the Belfast postcode area, [2] covers all of Northern Ireland and was the last part of the United Kingdom to be coded, between 1970 and 1974. [ citation needed ] This area is a group of 82 postcode districts in Northern Ireland, within 44 post towns and around 47,227 live postcodes.
A group of postcode districts with the same alphabetical prefix is called a postcode area. All, or part, of one or more postcode districts are grouped into post towns. [1] Until 1996, Royal Mail required counties to be included in addresses, except for 110 of the larger post towns.
English: Labelled Belfast inset map of Royal Mail postcode districts of the BT postcode area. Indicative postcode districts shown in red, post towns shown in grey. Equirectangular projection with latitude stretching 170%, WGS84 datum. Geographic limits: Main 1:153,000 map: West: 6.078W; East: 5.7669W; North: 54.689N; South: 54.506N
Many post towns are former "county towns" but postcode areas rarely align with the county (or successor authority) area. For example, within the PA postcode area the PA1 and PA78 postcode districts are 140 miles (225 km) apart, and cover 5 local authority areas; and the eight postcode areas of the London post town cover only 40% of Greater ...
A full postcode is known as a "postcode unit" and designates an area with several addresses or a single major delivery point. [1] The structure of a postcode is two alphanumeric codes that show, first, the post town and, second, a small group of addresses in that post town.
Address Management Guide (6th ed.). "Royal Mail major recode historical information – 2000 to September 2011" (PDF). Royal Mail. 3 November 2011. Archived from the original (PDF) on 26 September 2017
The next batch of numbers (200) represent the area code. The regional, district and area codes come together to form the postcode. The last batch of numbers (1987) represent the unique address of the location. A combination of the postcode and the unique address make up the digital address. [7] Gibraltar: GI: GX11 1AA Single code used for all ...