A geocode is a geographical code to identify a point or area at the surface of the earth.

The code systems can be described by:

• how the area is coded (number, letter, mixture of both, other)
• which part of the earth is covered (whole earth, land, water, a continent, a country)
• what kind of area or location is coded (country, county, airport, railstation, city, ...)
• whether an area or a point is coded
• time for which the code is valid

List of some code systems

Some of these code systems are free for use, others have different licences.

• Car License plates
• FIPS country codes (FIPS 10-4), area code, administrative, free
• FIPS place codes (FIPS 55) US only, free
• FIPS county codes (FIPS 6-4) US only, free
• FIPS state codes (FIPS 5-2) US only, free
• Geographic coordinate system with longitude / latitude, point system, with span it is an area system, free
• IATA airport codes, area /point codes, airports
• ICAO airport codes, area /point codes, airports
• IANA country codes similar to ISO 3166-1 alpha-2
• IOC country codes, area, worldwide
• ISO country codes area code, administrative ISO 3166-1 alpha-2 free
• ISO 3166-2 area code, administrative, subcountry
• ITU-R country codes
• ITU-T country calling codes
• ITU-T mobile calling codes
• MARC country codes
• NAC, area codes (area can be indefinitely small)
• NUTS area code, partially administrative, worldwide: countries, europe : country to community
• ONS code, UK only, administrative
• Postal codes, area, worldwide, country-codes by UPU, free
• UN code: http://unstats.un.org/unsd/methods/m49/m49regin.htm, area code, continents, countries (like ISO 3166-1 numeric)
• SALB (Second Administrative Level Boundaries), by UN [1]
• UN/LOCODE, area, administrative, cities
• UTM
• WMO

See also

• GIS