County · code 42019
Butler CountyPennsylvania
Butler County is a county in Pennsylvania, with its seat in Butler. The county was formed on March 12, 1800, and named after Richard Butler.
- Founded1800
- County seatButler
- Named forRichard Butler
- Land area789 sq mi + 6.2 sq mi water
- Population193,763 2020 Census
- Parcels mapped96,581 checked 15 October 2026
Where it is
Butler on the map of Pennsylvania
Pennsylvania has 67 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1800 from Allegheny County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Butler County was created from Allegheny County on March 12, 1800, but remained attached to Allegheny and not fully organized until November 7, 1803, when it was detached and fully organized. On May 5, 1864, Butler County gained a small area from Armstrong County to accommodate a local property owner.
- 1800Butler County created Butler created from Allegheny; not fully organized, attached to Allegheny. · Pa. Stat., ch. 2130, pp. 455, 460-461
- 1803Changed Butler fully organized, detached from Allegheny. · Pa. Stat., ch. 2391, sec. 1/17:480
- 1864Gained territory Butler gained small area from Armstrong to accommodate local property owner. · Pa. Laws 1864, no. 721, sec. 1/p. 826
Land and parcels
What the maps cover in Butler
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 96,581 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 19 August 2026 · checked 15 October 2026 -
Address points Missing
No public address points layer found for Butler 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
Butler 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
Butler 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 Butler County.
See your own lot on these maps
Open Butler 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 Butler County
- When was Butler County founded?
- Butler County was founded in 1800, formed from Allegheny County, and named after Richard Butler.
- What is the county seat of Butler County?
- The county seat of Butler County is Butler.
- Is there an online parcel map for Butler County?
- Yes. A public source publishes a parcel map of 96,581 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Butler County's boundary or name changed?
- Butler County was created in 1800 from Allegheny County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Allegheny County and Armstrong County.
- Is my lot in a flood zone?
- We do not have flood maps for Butler County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby