Government Information

"Geodata.gov is a geographic information system (GIS) portal, also known as the Geospatial One-Stop (GOS), that serves as a public gateway for improving access to geospatial information and data."

U. S. Census Bureau source for population, housing, economic, and geographic data

Downloadable data, shapefiles, imagery, base maps, etc.

Montana GIS data from the Natural Resource Information System

The National Atlas is an interactive map with thematic layers. One can designate topics of interest and set a specific geographic area. Publications ended in 2014, thus data herein is archived.

The National Atlas is an interactive map with thematic layers. One can designate topics of interest and set a specific geographic area. Publications ended in 2014, thus data herein is archived.

The National Map is an online, interactive map service with many possible layers of scientific data.

The source for flood map and Flood Insurance Rate Map (FIRMs) data