| | Camden County | MO | 29029 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=CamdenCounty+MO |
| | Callaway County | MO | 29027 | | Jefferson City, MO 27620 | Columbia-Jefferson
City-Moberly, MO 190 | Outlying | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=CallawayCounty+MO |
| | Caldwell County | MO | 29025 | | Kansas City, MO-KS 28140 | Kansas City-Overland
Park-Kansas City, MO-KS 312 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=CaldwellCounty+MO |
| | Butler County | MO | 29023 | | Poplar Bluff, MO 38740 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ButlerCounty+MO |
| | Buchanan County | MO | 29021 | | St. Joseph, MO-KS 41140 | Kansas City-Overland
Park-Kansas City, MO-KS 312 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BuchananCounty+MO |
| | Boone County | MO | 29019 | | Columbia, MO 17860 | Columbia-Jefferson
City-Moberly, MO 190 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=BooneCounty+MO |
| | Bollinger County | MO | 29017 | | Cape Girardeau, MO-IL 16020 | Cape Girardeau-Sikeston,
MO-IL 164 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=BollingerCounty+MO |
| | Benton County | MO | 29015 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=BentonCounty+MO |
| | Bates County | MO | 29013 | | Kansas City, MO-KS 28140 | Kansas City-Overland
Park-Kansas City, MO-KS 312 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=BatesCounty+MO |
| | Barton County | MO | 29011 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=BartonCounty+MO |