| | | Anne Arundel County | MD | 24003 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | in metro of > 1m | federal/state
government-dependent | https://maps.google.com/?q=AnneArundelCounty+MD |
| | | Baltimore city | MD | 24510 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | in metro of > 1m | federal/state
government-dependent | https://maps.google.com/?q=Baltimorecity+MD |
| | | Baltimore County | MD | 24005 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=BaltimoreCounty+MD |
| | | Carroll County | MD | 24013 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Outlying | in metro of > 1m | nonspecialized | https://maps.google.com/?q=CarrollCounty+MD |
| | | Harford County | MD | 24025 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Outlying | in metro of > 1m | federal/state
government-dependent | https://maps.google.com/?q=HarfordCounty+MD |
| | | Howard County | MD | 24027 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=HowardCounty+MD |
| | | Queen Anne's County | MD | 24035 | | Baltimore-Columbia-Towson,
MD 12580 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Outlying | in metro of > 1m | recreation | https://maps.google.com/?q=QueenAnne'sCounty+MD |
