U.S. Census Grids (Summary File 3), 2000
The U.S. Census Grids (Summary File 3), 2000 data set contains grids of demographic and socioeconomic data from the year 2000 U.S. census in ASCII and GeoTIFF  formats. The grids have a resolution of 30 arc-seconds (0.0083 decimal degrees), or approximately 1 square km. The gridded variables are based on census block …