Founded in 1857, Phelps County is one of 114 counties in the state of Missouri. Historically, Phelps County was formed from Crawford County. The city of Rolla is the county seat. With FIPS code of 161, Phelps County has a population of 44,937 and area of 673 square miles (1,743 km2).
List of all cities in Phelps County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Beulah, MO | 65436 | 573 |
| Big Piney, MO | 65550 | 573 |
| Duke, MO | 65461 | 573 |
| Edgar Springs, MO | 65462 | 573 |
| High Gate, MO | 65559 | 573 |
| Jerome, MO | 65529 | 573 |
| Lecoma, MO | 65401 | 573 |
| Missouri S & T, MO | 65409 | 573 |
| Newburg, MO | 65550 | 573 |
| Rolla, MO | 65401 | 573 |
| 65402 | 573 | |
| 65409 | 573 | |
| Rosati, MO | 65559 | 573 |
| Safe, MO | 65559 | 573 |
| Saint James, MO | 65559 | 573 |