| | | Codington County | SD | 46029 | | Watertown, SD 47980 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CodingtonCounty+SD |
| | | Black Hawk County | IA | 19013 | | Waterloo-Cedar Falls, IA 47940 | | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BlackHawkCounty+IA |
| | | Bremer County | IA | 19017 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=BremerCounty+IA |
| | | Grundy County | IA | 19075 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=GrundyCounty+IA |
| | | Naugatuck Valley Planning
Region | CT | 09140 | | Waterbury-Shelton, CT 47930 | New
Haven-Hartford-Waterbury,
CT 405 | Central | | | https://maps.google.com/?q=NaugatuckValleyPlanningRegion+Connecticut |
| | | District of Columbia | DC | 11001 | Washington, DC-MD 47764 | Washington-Arlington-Alexandria,
DC-VA-MD-WV 47900 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=DistrictofColumbia+DC |
| | | Charles County | MD | 24017 | Washington, DC-MD 47764 | Washington-Arlington-Alexandria,
DC-VA-MD-WV 47900 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=CharlesCounty+MD |
| | | Frederick County | MD | 24021 | Frederick-Gaithersburg-Bethesda,
MD 23224 | Washington-Arlington-Alexandria,
DC-VA-MD-WV 47900 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=FrederickCounty+Maryland |
| | | Montgomery County | MD | 24031 | Frederick-Gaithersburg-Bethesda,
MD 23224 | Washington-Arlington-Alexandria,
DC-VA-MD-WV 47900 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=MontgomeryCounty+Maryland |
| | | Prince George's
County | MD | 24033 | Washington, DC-MD 47764 | Washington-Arlington-Alexandria,
DC-VA-MD-WV 47900 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=PrinceGeorge'sCounty+MD |