COUNTY · UT
Summit County, Utah
Summit County is a county in Utah with FIPS code 49043 and an estimated population of 42,759 (Census 2023), 10th largest of 29 in the state.
County facts
- Name
- Summit County
- State
- Utah
- Type
- county
- FIPS code
- 49043
- State FIPS
- 49
- Population (2023)
- 42,759
- Change since 2020
- +0.6%
- State rank
- 10 of 29
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Summit County?
Summit County, Utah has the five-digit FIPS code 49043: 49 for the state and 043 for the county.
What state is Summit County in?
Summit County is in Utah.
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.