| | | Barry County | MO | 29009 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=BarryCounty+MO |
| | | Audrain County | MO | 29007 | | Mexico, MO 33020 | Columbia-Jefferson
City-Moberly, MO 190 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=AudrainCounty+MO |
| | | Atchison County | MO | 29005 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AtchisonCounty+MO |
| | | Andrew County | MO | 29003 | | St. Joseph, MO-KS 41140 | Kansas City-Overland
Park-Kansas City, MO-KS 312 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=AndrewCounty+MO |
| | | Adair County | MO | 29001 | | Kirksville, MO 28860 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=AdairCounty+MO |
