Geographic Locator Codes (GLCs) Overview

A GLC is an alphanumeric code that federal agencies use to identify geographic location. Use of these codes facilitates the interchange of data between federal agencies, state and local groups.

The Real Property Policy Division (Division) within the General Services Administration’s Office of Government-wide Policy assigns and maintains GLCs for cities and towns worldwide that are categorized as populated places or military areas. These codes are used by federal agencies to report the location of real property assets in the Federal Real Property Profile Management System. The Office of Personnel Management (OPM) uses codes for duty station location codes and other activities related to processing personnel actions.

In fiscal year 2014, the Division, in an effort to standardize GLCs, formally adopted the use of state, and county codes from the Geographic Names Information System (GNIS), maintained by the U.S. Geological Service; and country codes from the GeoNet Names Server (GNS) registry maintained by the National Geospatial Intelligence Agency. These are official sources for GLCs.

In 2016, the Division began the process of aligning its GLCs with the geographical feature information in GNIS. As such, most but not all GSA domestic city and town codes corresponding to GNIS feature identifiers can now be found in GNIS. This process is ongoing.

For the convenience of other federal agencies, GSA maintains downloadable spreadsheets of U.S., U.S. territories, and foreign country geolocation codes which can be found at the links on the left of this page.

GNIS and GNS Databases

The list below contains links for city, state, county, and country geolocation codes in the databases maintained by GNIS and GNS.

The city, state, and county link will take users to the GNIS database that contains information about geographic features in the U.S. and U.S. territories, including names, historic and descriptive information, locations, topographic map, and geographic coordinates. Users can access the information through search queries or file downloads.

The country link will take users to the GNS database that contains information about geographic features in foreign countries, including the official spellings of foreign place names, cartography, and geospatial intelligence. Users can access the information through search queries and web map services with graphical search capability.

Requests to GSA for New Codes for Cities and Towns

A federal entity may request a new code for any U.S., U.S. territory, or foreign city or town that is categorized as a feature class of populated place or military area. This includes duty station locations used for personnel reporting. Requests should be made in writing to the contact group listed at the top right of this page.

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