| | | Alfalfa County | OK | 40003 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AlfalfaCounty+OK |
| | | Alexandria city | VA | 51510 | Arlington-Alexandria-Reston,
VA-WV 11694 | 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=Alexandriacity+VA |
| | | Alexander County | IL | 17003 | | Cape Girardeau, MO-IL 16020 | Cape Girardeau-Sikeston,
MO-IL 164 | Outlying | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=AlexanderCounty+IL |
| | | Alexander County | NC | 37003 | | Hickory-Lenoir-Morganton,
NC 25860 | Charlotte-Concord, NC-SC 172 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=AlexanderCounty+NC |
| | | Aleutians West Census
Area | AK | 02016 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=AleutiansWestCensusArea+AK |
| | | Aleutians East Borough | AK | 02013 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=AleutiansEastBorough+AK |
| | | Alcorn County | MS | 28003 | | Corinth, MS 18420 | Tupelo-Corinth, MS 539 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=AlcornCounty+MS |
| | | Alcona County | MI | 26001 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=AlconaCounty+MI |
| | | Albemarle County | VA | 51003 | | Charlottesville, VA 16820 | | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=AlbemarleCounty+VA |
| | | Albany County | NY | 36001 | | Albany-Schenectady-Troy,
NY 10580 | Albany-Schenectady, NY 104 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=AlbanyCounty+NY |