COUNTY · TX

McLennan County, Texas

McLennan County is a county in Texas with FIPS code 48309 and an estimated population of 268,583 (Census 2023), 21st largest of 254 in the state.

County facts

Name: McLennan County
State: Texas
Type: county
FIPS code: 48309
State FIPS: 48
Population (2023): 268,583
Change since 2020: +2.8%
State rank: 21 of 254

Population is the Census Bureau’s Vintage 2023 estimate.

Major cities in McLennan County

Waco

Other counties in Texas

Harris County Dallas County Tarrant County Bexar County Travis County Collin County Denton County Fort Bend County All 254

Questions

What is the FIPS code for McLennan County?

McLennan County, Texas has the five-digit FIPS code 48309: 48 for the state and 309 for the county.

What state is McLennan County in?

McLennan County is in Texas.

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.