"Annual Estimates of the Population for Incorporated Places Over 100,000, Ranked by July 1, 2007 Population: April 1, 2000, to July 1, 2007" (CSV). 2007 Population Estimates. U.S. Census Bureau, Population Division. July 8, 2008. Retrieved 2007-06-28.  in Excel format "Annual Estimates of the Resident Population for the United States, Regions, States, and Puerto Rico: April 1, 2000 to July 1, 2008". United States Census Bureau. Retrieved 2009-02-01.  "Elevations and Distances in the United States". U.S Geological Survey. April 29, 2005. Retrieved November 3 2006.  Unknown parameter |dateformat= ignored (help); Check date values in: |access-date= (help)