Founded in 1855, Olmsted County is one of 87 counties in the state of Minnesota. Historically, Olmsted County was formed from Fillmore County, Wabasha County, and Rice County. The city of Rochester is the county seat. With FIPS code of 109, Olmsted County has a population of 163,436 and area of 653.01 square miles (1,691 km2).
List of all cities in Olmsted County, MN alphabetically
| City/Town | Postal Code | Area Code |
| Byron, MN | 55920 | 507 |
| Douglas, MN | 55960 | 507 |
| Dover, MN | 55929 | 507 |
| Eyota, MN | 55934 | 507 |
| High Forest, MN | 55976 | 507 |
| Mayo Clinic, MN | 55905 | 507 |
| Oronoco, MN | 55960 | 507 |
| Pleasant Grove, MN | 55976 | 507 |
| Predmore, MN | 55934 | 507 |
| Rochester, MN | 55901 | 507 |
| 55902 | 507 | |
| 55903 | 507 | |
| 55904 | 507 | |
| 55905 | 507 | |
| 55906 | 507 | |
| Stewartville, MN | 55976 | 507 |
| Viola, MN | 55934 | 507 |