Download State Files

The data used in the Atlas project is readily available to download to be consulted, reviewed, and reused. For ideas about how to use this data, please consult our "Using the Atlas" page.

State Name GIS Files KMZ Files PDF Files
Alabama 8.2 MB 4.8 MB 35.1 MB
Alaska 42.9 MB 27.6 MB 16.8 MB
Arizona 2.2 MB 1.4 MB 3.2 MB
Arkansas 10.0 MB 6.1 MB 37.0 MB
California 10.4 MB 6.5 MB 17.9 MB
Colorado 9.4 MB 6.7 MB 27.5 MB
Connecticut 2.1 MB 1.3 MB 7.0 MB
Dakota Territory 10.0 MB 6.1 MB 22.4 MB
Delaware 0.8 MB 0.5 MB 2.1 MB
District of Columbia 0.1 MB 0.02 MB 0.2 MB
Florida 26.8 MB 16.6 MB 28.7 MB
Georgia 20.8 MB 11.5 MB 98.1 MB
Hawaii 0.7 MB 0.4 MB 0.3 MB
Idaho 12.2 MB 7.5 MB 12.2 MB
Illinois 13.5 MB 8.3 MB 18.4 MB
Indiana 10.7 MB 6.6 MB 21.5 MB
Iowa 3.1 MB 1.9 MB 9.6 MB
Kansas 2.1 MB 1.2 MB 13.6 MB
Kentucky 15.1 MB 9.4 MB 43.7 MB
Louisiana 10.7 MB 6.6 MB 27.2 MB
Maine 51.0 MB 30.2 MB 17.0 MB
Maryland 7.2 MB 4.3 MB 10.9 MB
Massachusetts 28.8 MB 17.1 MB 14.8 MB
Michigan 31.4 MB 19.3 MB 18.9 MB
Minnesota 24.2 MB 15.0 MB 20.1 MB
Mississippi 7.6 MB 4.7 MB 24.8 MB
Missouri 13.1 MB 7.9 MB 34.9 MB
Montana 13.9 MB 8.7 MB 16.6 MB
Nebraska 4.3 MB 2.6 MB 12.3 MB
Nevada 1.6 MB 0.9 MB 4.7 MB
New Hampshire 1.4 MB 0.9 MB 2.7 MB
New Jersey 4.1 MB 2.4 MB 8.4 MB
New Mexico 1.9 MB 1.1 MB 6.9 MB
New York 10.0 MB 6.0 MB 19.4 MB
North Carolina 16.7 MB 10.5 MB 42.1 MB
North Dakota 1.0 MB 0.5 MB 4.0 MB
Ohio 9.1 MB 5.3 MB 19.0 MB
Oklahoma 5.3 MB 3.3 MB 7.8 MB
Oregon 16.9 MB 10.3 MB 14.3 MB
Pennsylvania 4.2 MB 2.7 MB 17.9 MB
Rhode Island 2.8 MB 1.6 MB 2.3 MB
South Carolina 9.2 MB 5.8 MB 24.0 MB
South Dakota 1.0 MB 0.6 MB 5.7 MB
Tennessee 11.3 MB 6.2 MB 64.2 MB
Texas 44.3 MB 27.7 MB 69.2 MB
Utah 5.6 MB 3.4 MB 7.9 MB
Vermont 1.8 MB 1.1 MB 5.5 MB
Virginia 19.3 MB 12.0 MB 72.0 MB
Washington 22.8 MB 13.9 MB 18.4 MB
West Virginia 1.8 MB 1.1 MB 5.5 MB
Wisconsin 24.0 MB 14.8 MB 20.5 MB
Wyoming 4.4 MB 2.7 MB 4.5 MB

GIS Files

Download a zipped folder containing the full dataset for the selected state. Each zipped folder contains the following files:

  1. Historical Counties Shapefile (polygons) for the state's counties and county equivalents.
  2. Small_Changes shapefile (point feature) for all changes too small to map [if available].
  3. Comprehensive Database (tab-delimited text file) for all historical data.
  4. Copies of all the historical chronologies, supplemental texts, and metadata forms.
  5. Copy of the free access Attribution-NonCommercial-ShareAlike Creative Commons License.

KMZ Files

Download a zipped folder of Atlas data formatted to be used with Google Earth and Google Maps.

PDF Files

Download a zipped folder containing Atlas data for each county in a state formatted in a printer and reader friendly format.