Online version of A to Z GIS

Aggregates articles on GIS, events, and news about GIS and jobs.

This is a question and answer site for cartographers and GIS professionals.

Over 25,000 free GIS datasets primarily from U.S. federal, state, and local agencies, but some international areas, too.

Colllection of over 100,000 geospatial datasets in all sort of formats, from federal and state agencies, universities, non-profits, city governments, and other entities.

Includes the TIGER/Line Shapefile boundaries for Census geographies.

From the US Geological Survey

An open data site from the Dept. of Homeland Security with a lot of GIS layers relating to infrastructure in the United States.

US Dept. of Agriculture

US boundary files for 1790 through 2010

Includes flooding data

VDOT Open data

VA Department of Conservation and Recreation