Census Counties, 1990 - Illinois
- This datalayer displays the counties for the state, based on a ground condition of January 1, 1990. The primary legal divisions of most states are termed ''counties.'' Each county and statistically equivalent entity is assigned a three-digit Federal Information Processing Standards code that is unique within the state. These codes are assigned in alphabetical order of county or county equivalent within each state.
- U.S. Department of Commerce, Bureau of the Census, Geography Division
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