Founded in 1818, Montgomery County is one of 114 counties in the state of Missouri. Historically, Montgomery County was formed from St. Charles County. The city of Montgomery City is the county seat. With FIPS code of 139, Montgomery County has a population of 11,415 and area of 539 square miles (1,396 km2).
List of all cities in Montgomery County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Americus, MO | 65069 | 573 |
| Bellflower, MO | 63333 | 573 |
| Big Springs, MO | 63363 | 573 |
| Bluffton, MO | 65069 | 573 |
| Buell, MO | 63361 | 573 |
| Danville, MO | 63361 | 573 |
| Gamma, MO | 63333 | 573 |
| High Hill, MO | 63350 | 636 |
| Jonesburg, MO | 63351 | 636 |
| Liege, MO | 63333 | 573 |
| Middletown, MO | 63359 | 573 |
| Mineola, MO | 63361 | 573 |
| Montgomery, MO | 63361 | 573 |
| Montgomery City, MO | 63361 | 573 |
| New Florence, MO | 63363 | 573 |
| New Hartford, MO | 63359 | 573 |
| Prices Branch, MO | 63363 | 573 |
| Rhineland, MO | 65069 | 573 |
| Starkenburg, MO | 65069 | 573 |
| Wellsville, MO | 63384 | 573 |