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| | Current Lists of Metropolitan and Micropolitan Statistical Areas and Definitions |
 | | A metropolitan or micropolitan statistical area's geographic delineation, or list of geographic components at a particular point in time, is referred to as its "definition." Metropolitan and micropolitan statistical areas are defined by the U.S. Office of Management and Budget (OMB) and are the result of the application of published standards to Census Bureau data. |
 | | December 2006 (OMB Bulletin No. 07-01) announcing updates to metropolitan and micropolitan statistical areas as of December 2006, based on the Census Bureau’s July 1, 2004 and July 1, 2005 population estimates for cities and towns, and in specified circumstances, local opinion. |
 | | December 2005 (OMB Bulletin No. 06-01) announcing updates to metropolitan and micropolitan statistical areas as of December 2005, based on the Census Bureau’s July 1, 2003 and July 1, 2004 population estimates for cities and towns, and in specified circumstances, local opinion. |
| www.census.gov /population/www/estimates/metrodef.html (515 words) |
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