A

• Lists of airports by ICAO code (26 P)

C

• Country codes (2 C, 27 P)
• Country subdivision codes (2 P)

F

• FIPS 10 (13 P)

G

• Geographic coordinate lists (19,930 P)
• Geographic object identifiers (3 P)

I

• ISO 3166 (260 P)

L

• Lists of airports by IATA code (27 P)
• Lists of postal codes (1 C, 8 P)

N

• Nomenclature of Territorial Units for Statistics (8 C, 43 P)

T

• Telephone numbers by country (20 C, 283 P)

U

• UN/LOCODE (1 C, 3 P)
• United Nations geoscheme (1 C, 2 P)

W

• World Geographical Scheme for Recording Plant Distributions (1 C, 2 P)

• Geocode

*

• Address geocoding

0–9

• 003 (UN M.49 code)

A

• Administrative division codes of China

B

• BC Geographical Names
• BT site engineering code

C

• C-squares
• Chapman code
• Classification of objects of the administrative-territorial system of Ukraine
• Common Language Location Identification
• Codifier of administrative-territorial units and territories of territorial communities
• Community Identification Number
• Country code

F

• Federal Information Processing Standard state code

G

• Gazetteer of Australia
• Geo (microformat)
• Geo URI scheme
• Geo-imputation
• Geographic Locator Codes
• Geographic Names Information System
• Geographical Names Board of Canada
• Geohash
• Geohash-36
• GeoNames
• GEOnet Names Server
• GeoSMS
• Geotagging
• Grid (spatial index)
• GSS coding system

H

• Hydrologic unit system (United States)
• Hydrological code

I

• List of IATA-indexed railway stations, bus stations and ferry terminals
• ICAO airport code
• ICES Statistical Rectangles
• IATA airport code
• International Map of the World

L

• Longhurst code

M

• Maidenhead Locator System
• Marsden square
• Military Grid Reference System

N

• Natural Area Code
• Nomenclature of Territorial Units for Statistics

O

• Oblique Mercator projection
• OKATO
• OKTMO
• ONS coding system
• Open Location Code
• Ordnance Survey National Grid

P

• Permanent Committee on Place Names
• Pfafstetter Coding System
• Place code
• Populated place
• List of postal codes
• Projected coordinate system

Q

• QDGC
• QRA locator

R

• Reverse geocoding

S

• Schedule K
• Standard Geographical Classification code (Canada)
• Standard Interchange Format
• State and Experimental Aviation Point Location Index

T

• Transverse Mercator projection
• Transverse Mercator: Bowring series
• Transverse Mercator: Redfearn series
• Tz database

U

• UBIGEO
• UN/LOCODE
• UN M49
• Unique Feature Identifier
• Unique Property Reference Number
• Unique Street Reference Number
• United States Board on Geographic Names
• United States National Grid

W

• What3words
• WOEID
• World Geographic Reference System
• World Geographical Scheme for Recording Plant Distributions
• World Meteorological Organization squares

X

• XCC