PARISH · LA
Jefferson Parish, Louisiana
Jefferson Parish is a parish in Louisiana with FIPS code 22051 and an estimated population of 421,777 (Census 2023), 2nd largest of 64 in the state.
County facts
- Name
- Jefferson Parish
- State
- Louisiana
- Type
- parish
- FIPS code
- 22051
- State FIPS
- 22
- Population (2023)
- 421,777
- Change since 2020
- -4.1%
- State rank
- 2 of 64
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Jefferson Parish?
Jefferson Parish, Louisiana has the five-digit FIPS code 22051: 22 for the state and 051 for the county.
What state is Jefferson Parish in?
Jefferson Parish is in Louisiana.
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.