Maps & Graphics

Animated map of the United States - Each point of light reflects 10,000 persons

Animated map of the United States - Each point of light reflects 1/10,000th of the Total Population

Animated map of the United States - Each point of light reflects 1/10,000 of the Black Population

Animated map of the United States - Each contemporary county is shaded to reflect the Percent of the county's Total Population that is Black . The five ranges defined are of equal width, with lightest shading reflecting 0-20% black, and darkest blue reflecting 80-100% black.


Source Data:
1910-1970 "Historical, Demographic, Economic and Social Data: The United States, 1790-1970 (ICPSR)
1980 "1980 Census Summary Tape File 3", extracts taken from CIESIN's state-specific SAS transport files
1990 "1990 Summary Tape File 3A Standard Extracts of 'Frequently Asked For Variables'" drawn from CIESIN's SAS transport files
2000 "2000 Redistricting Data (PL 94-171) Summary File, Census Bureaus's May 2001 release
Boundary Data:
Historical United States County Boundary Files (HUSCO), 1790-1999 (Geoscience Publications, LSU).

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