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National Historical Geographic Information System

from their web page: "The National Historical Geographic Information System (NHGIS) is a project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2015." Free account creation required.

Creator: 
NHGIS
Date of creation: 
1790
Data edited date: 
2015
Temporal extent: 
1790 to 2015
Publisher: 
NHGIS
Data type: 
Require permission to use?: 
None
Require acknowledgement to use?: 
None
Cost for use: 
None
Medium: 
web
Restrictions: 
Public
Open data: