“Standard Metropolitan Areas (SMAs) and Components” (TXT). Standard Metropolitan Areas defined by the Bureau of the Budget, October 13, 1950. United States Census Bureau, Population Division (2000年12月14日). 2009年2月7日閲覧。
“Metropolitan Areas and Components, 1983” (Text file). Metropolitan Areas defined by Office of Management and Budget, June 27, 1983. United States Census Bureau, Population Division (2001年3月1日). 2009年2月7日閲覧。
“Metropolitan Statistical Areas and Components, 2003” (Text file). Metropolitan statistical areas defined by Office of Management and Budget, June 6, 2003. United States Census Bureau, Population Division (2003年7月10日). 2009年2月7日閲覧。
