Founded in 1907, Twin Falls County is one of 44 counties in the state of Idaho. Historically, Twin Falls County was formed from Cassia County. The city of Twin Falls is the county seat. With FIPS code of 83, Twin Falls County has a population of 92,243 and area of 1,925 square miles (4,986 km2).
List of all cities in Twin Falls County, ID alphabetically
| City/Town | Postal Code | Area Code |
| Buhl, ID | 83316 | 208 |
| Castleford, ID | 83321 | 208 |
| Clover, ID | 83316 | 208 |
| CSI, ID | 83301 | 208 |
| 83303 | 208 | |
| Curry, ID | 83328 | 208 |
| Deep Creek, ID | 83316 | 208 |
| Filer, ID | 83328 | 208 |
| Hansen, ID | 83334 | 208 |
| Hollister, ID | 83301 | 208 |
| Kimberly, ID | 83341 | 208 |
| Lynwood, ID | 83301 | 208 |
| Murtaugh, ID | 83344 | 208 |
| Rock Creek, ID | 83334 | 208 |
| Rogerson, ID | 83302 | 208 |
| Roseworth, ID | 83321 | 208 |
| Three Creek, ID | 83301 | 208 |
| 83302 | 208 | |
| Twin Falls, ID | 83301 | 208 |
| 83302 | 208 | |
| 83303 | 208 |