Create Google Map Overlays with County Data

Changes in county voting patterns from 2004 to 2008 in the USA Presidential Elections

Blue-Green more Democratic, Red-Orange more Republican

Shapefile source:

For the next step a URL targeting your data file is required.

The text file format required:

Census_FIPS_ID Value
1002 89
1101 33
2103 43


Id and value columns in your file can be delimited by commas, tabs, or spaces.

Values can denote quantiles from your own scheme using a subset of single digits (0,1,2,3,4,5,6,7,8,9) or RGB-tuple color values (ie. (255,0,0) ).

Example Maps and Data of Presidential Voting Patterns by County
To make a test map, submit these URLs above.
Democratic Margin in 08 Presidential Voting
Democratic Margin in 04 Presidential Voting
Gain for Democratic votes from '04 to '08
Voting Majority Switched Support from '04 to '08

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On December 31, 2010, based on data from the 2010 Census, this site will publish web maps showing decadal population growth that affects the apportioning of seats in the US House of Representatives.