County · code 27109
Olmsted CountyMinnesota
Olmsted County is a Minnesota county with its seat in Rochester, created in 1855.
- Founded1855
- County seatRochester
- Named forDavid Olmsted
- Land area654 sq mi + 1.3 sq mi water
- Population162,847 2020 Census
- Parcels mapped67,287 checked 14 October 2026
Where it is
Olmsted on the map of Minnesota
Minnesota has 87 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1855 from Fillmore County, Rice County and Wabasha County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Olmsted County was created from Fillmore, Rice, and Wabasha Counties on February 20, 1855. It was named after David Olmsted. The county was fully organized for government and judicial purposes on August 27, 1855, and gained territory from Mower County on May 26, 1857.
- 1855Olmsted County created Olmsted created from Fillmore, Rice, Wabasha, and Non-County Area 4. Non-County Area 4 eliminated. · Minn. Terr. Laws 1855, ch. 6, sec. 1/pp. 22-23
- 1855Changed Olmsted fully organized for county government and judicial purposes. · HRS Minn., Olmsted, 5
- 1857Gained territory Olmsted gained from Mower. · Minn. Terr. Laws 1857, ext. sess., ch. 88, sec. 1/p. 316
Land and parcels
What the maps cover in Olmsted
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 67,287 parcels from Olmsted County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Official
One point per address, 72,925 in all from Minnesota Geospatial Information Office (MnGeo), Minnesota Geospatial Commons.
checked 13 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Olmsted by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Olmsted County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Olmsted County.
See your own lot on these maps
Open Olmsted County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Olmsted County
- When was Olmsted County founded?
- Olmsted County was founded in 1855, formed from Fillmore County, Rice County and Wabasha County, and named after David Olmsted.
- What is the county seat of Olmsted County?
- The county seat of Olmsted County is Rochester.
- Is there an online parcel map for Olmsted County?
- Yes. Olmsted County publishes a parcel map of 67,287 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Olmsted County's boundary or name changed?
- Olmsted County was created in 1855 from Fillmore County, Rice County and Wabasha County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Mower County.
- Is my lot in a flood zone?
- We do not have flood maps for Olmsted County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby