COUNTY · FL
Martin County, Florida
Martin County is a county in Florida with FIPS code 12085 and an estimated population of 163,315 (Census 2023), 33rd largest of 67 in the state.
County facts
- Name
- Martin County
- State
- Florida
- Type
- county
- FIPS code
- 12085
- State FIPS
- 12
- Population (2023)
- 163,315
- Change since 2020
- +2.9%
- State rank
- 33 of 67
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Martin County?
Martin County, Florida has the five-digit FIPS code 12085: 12 for the state and 085 for the county.
What state is Martin County in?
Martin County is in Florida.
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.