COUNTY · PA
Butler County, Pennsylvania
Butler County is a county in Pennsylvania with FIPS code 42019 and an estimated population of 198,413 (Census 2023), 19th largest of 67 in the state.
County facts
- Name
- Butler County
- State
- Pennsylvania
- Type
- county
- FIPS code
- 42019
- State FIPS
- 42
- Population (2023)
- 198,413
- Change since 2020
- +2.2%
- State rank
- 19 of 67
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Butler County?
Butler County, Pennsylvania has the five-digit FIPS code 42019: 42 for the state and 019 for the county.
What state is Butler County in?
Butler County is in Pennsylvania.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.