Some of you have already found this page using the original materials sent by Mike Ratcliffe, but just in case this makes your life easier…
Scroll to the bottom of the page to see the map showing the new Urbanized Areas. I have not reviewed each to look for adjacency to existing MPOs.
http://www.census.gov/geo/www/maps/2010_census_UA_maps/US_UAUC_2010.html
Elaine Murakami
FHWA Office of Planning
206-220-4460 (in Seattle)