Source Information

• US county data source information

  Primary source:

  Wolfram|Alpha Knowledgebase, 2024.

  Background sources and references:

  • Counties USA: A Directory of United States Counties. (3rd ed.) Omnigraphics, 2006.
  • Donato, T. E., et al. (Eds.). Demographics USA 2008: County Edition. Trade Dimensions, 2008.
  • National Association of Counties. NACo. »
  • Trumpet Marketing Group, LLC. United States Map with Counties. »
  • United States Census Bureau. "The 2009 Statistical Abstract." The National Data Book. »
  • United States Census Bureau. State & County QuickFacts. »
  • United States Government. "American Hometowns—Cities, Counties, and Towns." USA.gov. »

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