Geographic Names Information System

GNIS was established to provide a single, consistent set of geographic names for the United States and its territories, eliminating the confusion caused by multiple names for the same feature or the same name applied to different features. It is administered by the U.S. Geological Survey, which maintains the database in cooperation with the Board on Geographic Names, a federal body that standardizes names for official use. The system is part of the National Map and is integrated with other federal geographic data, such as the National Hydrography Dataset and the Census Bureau's TIGER files.

GNIS data are used by federal agencies like the Federal Emergency Management Agency (FEMA) for disaster response, by the U.S. Census Bureau for mapping, and by the U.S. Postal Service for addressing. The database is also a key component of the Geographic Names Information System's role in the United Nations Conference on the Standardization of Geographical Names, where it contributes to international name standardization efforts.

The origins of GNIS trace back to the 1890s, when the U.S. Board on Geographic Names was created to resolve naming disputes. In the 1960s, the USGS began a systematic effort to compile all named features from topographic maps, which led to the creation of the Geographic Names Information System in the 1970s. The database was first made available to the public in 1981, and it has been continuously updated since then.

Initially, GNIS contained only names from USGS topographic maps, but it later expanded to include names from other federal sources, such as the U.S. Forest Service and the National Park Service. In 2004, GNIS became part of the National Map, a collaborative effort to provide consistent geographic data for the nation. The system has also incorporated names from historical maps and documents, making it a valuable resource for historians and genealogists.

GNIS records include the official feature name, the state and county, geographic coordinates (latitude and longitude), elevation, and the feature class (e.g., populated place, stream, summit, or church). Each record also includes a unique feature identifier, which is used to link GNIS to other databases. The database covers all 50 states, the District of Columbia, and U.S. territories, including Puerto Rico, Guam, and the U.S. Virgin Islands.

Feature classes are defined by the Federal Geographic Data Committee, and they range from natural features like valleys and ridges to man-made features like dams and airports. GNIS also includes historical names, which are marked as such, and variant names, which are alternative spellings or names that have been used in the past. The database is updated regularly through submissions from federal, state, and local agencies, as well as from the public through the GNIS web interface.

One of the lesser-known aspects of GNIS is its role in the federal government's response to the COVID-19 pandemic, where it was used to identify and map healthcare facilities. Another is its inclusion of underwater features, such as seamounts and reefs, which are named by the BGN and included in GNIS. The database also contains names for features in Antarctica, which are maintained by the Advisory Committee on Antarctic Names.

GNIS has been used in academic research to study the cultural and linguistic history of place names, such as the distribution of Native American place names across the United States. It has also been used to identify potential errors in other geographic databases, such as the Census Bureau's TIGER files, by cross-referencing feature names and locations. Additionally, GNIS data are freely available for download, and they are used by many commercial mapping applications, including Google Maps and OpenStreetMap, to ensure consistent naming.

Board on Geographic Names

A federal body that standardizes geographic names for official use in the United States.

Feature class

A category that describes the type of geographic feature, such as populated place, stream, or summit.

Variant name

An alternative name or spelling for a geographic feature that has been used historically.