Geographic Names Information System (GNIS)

The National Geologic Map Database Data Portal is intended to: 1) give the user a quick browse and query of our Nation's geologic maps, in a standardized format, and 2) link the user to the source information found via the
The Geographic Names Information System (GNIS), developed by the U.S. Geological Survey (USGS) in cooperation with the U.S.
Federal, State, local, and non-governmental data partners submit new features and edit existing features continuously in the GNIS database.
A variant is any other name by which a feature is or was known. Such names can be historical or no longer used, or can be in use, but less widespread. Only one official feature name is allowed for Federal usage.
Geographically, and as a general reference, the United States (short form of the official name, United States of America) includes all areas considered under the sovereignty of the United States, but does not include leased areas.
Several categories with different meanings and requirements fall under the jurisdiction of the United States and are contained in the GNIS data.
There are 3,141 counties and county equivalents in the 50 States and the District of Columbia. They are categorized as follows:
There are no official definitions of city, town, village, hamlet, neighborhood, etc.
GNIS data is available from a number of sources and services.