Rochester is a city in the U.S. state of Minnesota and is the county seat of Olmsted County. Located on both banks of the Zumbro River, the city has a population of 106,769 according to the 2010 United States Census, making it Minnesota's third-largest city and the largest outside of the Minneapolis-St. Paul-Bloomington Metropolitan Statistical Area. The territorial legislature created Olmsted County on February 20, 1855, with Rochester named county seat in 1857. Rochester developed as a stagecoach stop between Saint Paul, Minnesota, and Dubuque, Iowa. When the railroad arrived in the 1860s,... it brought new residents and business opportunities. In 1863, Dr. William W. Mayo arrived as the examining surgeon for draftees in the Civil War. On August 21, 1883, the Great Tornado demolished much of Rochester, leaving 37 dead and about 200 injured. There was no medical facility at the time, so Mayo and his two sons worked together to care for the wounded. Donations of $60,000 were collected and the Sisters of St. Francis, assisted by Mayo, opened a new facility named St. Marys Hospital in 1889.
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| County: | Olmsted County |
| State: | Minnesota |
| Country: | United States of America |
| Population: | 100,413 |
| Area: | 39.8 sq. mi. |
| Time zone: | Central Time zone |
| Also known as: | Rochester, Minnesota, Rochester, MN, Olmsted County / Rochester city |