County · code 55133
Waukesha CountyWisconsin
Waukesha County is a county in Wisconsin with its seat in the city of Waukesha. The county was created in 1846 and became part of the state of Wisconsin in 1848.
- Founded1846
- County seatWaukesha
- Land area550 sq mi + 31 sq mi water
- Population406,978 2020 Census
- Parcels mapped157,561 checked 16 October 2026
Where it is
Waukesha on the map of Wisconsin
Wisconsin has 72 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1846 from Milwaukee County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Waukesha County was created on April 9, 1846 by Wisconsin Territory from Milwaukee County. The county became part of the state of Wisconsin on May 29, 1848.
- 1846Waukesha County created Waukesha created by Wisconsin Territory from Milwaukee. · History of Waukesha, 358-359; Milwaukee Sentinel, 9 Apr. 1846; Wis. Terr. Laws 1846, pp. 22-23
- 1848Became part of Wisconsin Waukesha became a county in the state of Wisconsin. · U.S. Stat., vol. 9, ch. 89 [1846]/pp. 56-58, and ch. 50 [1848]/pp. 233-235; Van Zandt, 128, 130
Land and parcels
What the maps cover in Waukesha
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 157,561 parcels from Waukesha County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 23 January 2025 · checked 16 October 2026 -
Address points Missing
No public address points layer found for Waukesha County yet.
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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
Waukesha 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
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Records
- Clerk of court: deeds and plats
Court Official Directory
Zoning and code
County government
- County government
The official website of Waukesha County.
See your own lot on these maps
Open Waukesha 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 Waukesha County
- When was Waukesha County founded?
- Waukesha County was founded in 1846, formed from Milwaukee County.
- What is the county seat of Waukesha County?
- The county seat of Waukesha County is Waukesha.
- Is there an online parcel map for Waukesha County?
- Yes. Waukesha County publishes a parcel map of 157,561 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Waukesha County's boundary or name changed?
- Waukesha County was created in 1846 from Milwaukee County. Since then the Atlas of Historical County Boundaries records 1 later change.
- Who issues building permits in Waukesha County?
- The county's page on building permits: Permits. Inside a city or town, ask that city first.
- Who issues septic and well permits in Waukesha County?
- The county's page on septic systems and wells: Health department: septic and well.
- Is my lot in a flood zone?
- We do not have flood maps for Waukesha County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby