I am trying to locate maps online of the Metropolitan Statistical Areas (MSAs) for all US states and Puerto Rico and haven't had much luck. Can you tell me where I might find these maps?

You can find online maps of the MSA’s at the US Census Bureau’s TIGER mapping service, the URL is:

http://tiger.census.gov/cgi-bin/mapbrowse-tbl

There is more information on Metropolitan Areas and a link to order a paper map of them at:

http://www.census.gov/population/www/estimates/metroarea.html

Finally, if you need to do GIS type analysis, our archive of census data has block group boundaries that could be used to derive MSA’s. This would require downloading the data and working with it in a GIS. The URL is:

http://sedac.ciesin.columbia.edu/plue/cenguide.html

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