COUNTY · IN

St. Joseph County, Indiana

St. Joseph County is a county in Indiana with FIPS code 18141 and an estimated population of 272,848 (Census 2023), 5th largest of 92 in the state.

County facts

Name: St. Joseph County
State: Indiana
Type: county
FIPS code: 18141
State FIPS: 18
Population (2023): 272,848
Change since 2020: +0.1%
State rank: 5 of 92

Population is the Census Bureau’s Vintage 2023 estimate.

Major cities in St. Joseph County

South Bend

Other counties in Indiana

Marion County Lake County Allen County Hamilton County Elkhart County Tippecanoe County Hendricks County Vanderburgh County All 92

Questions

What is the FIPS code for St. Joseph County?

St. Joseph County, Indiana has the five-digit FIPS code 18141: 18 for the state and 141 for the county.

What state is St. Joseph County in?

St. Joseph County is in Indiana.

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.