Summit County, Utah

Summit County population, land area and income

Summit County had 43,109 residents in the Census Vintage 2024 estimate, on 1,870.7 square miles of land. It ranks 10th of 29 in Utah by population and 18th by land area. That works out to 23.0 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Utah has 20,803 residents, so Summit County is 2.1 times that size.

Its SAIPE 2023 median household income of $139,848 is in the top tenth among 3,143 counties with an estimate.

How Summit County's population changed since 2020

Summit County gained 624 residents between the July 2020 and July 2024 estimates, a rise of 1.5%. That ranks 25th of 29 in Utah for growth. The median Utah county changed by +5.7%, and the state as a whole by +6.7%.

Since the April 2020 estimates base, Summit County recorded 1,767 births and 865 deaths, a natural change of +902. Net international migration added +701 and net domestic migration, people moving to or from other US counties, came to -901. The largest single component was natural change, which added 902 people.

Where Summit County is

The Census internal point of Summit County is at 40.872100, -110.968500. It sits in UTM zone 12N. The map shades Utah's 29 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Summit County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Summit County

5 incorporated places of 1,000+ people have residents in Summit County, 15,387 people together, or 36% of the county. Each figure counts only the part of the town inside Summit County; towns marked "part" extend into another county. The largest is Park City with 8,278.

Counties bordering Summit County

The Census 2024 county adjacency file lists 8 neighbors for Summit County, including 2 across a state line. The most populous is Salt Lake County, UT, with 1,216,274 residents. Distances run between Census internal points in a straight line.

• Salt Lake County

  1,216,274 people

  52 mi WSW

• WY

  Sweetwater County, WY

  41,273 people

  122 mi ENE

• Wasatch County

  37,858 people

  38 mi SSW

• Duchesne County

  20,803 people

  49 mi SE

• WY

  Uinta County, WY

  20,621 people

  36 mi NE

• Morgan County

  13,093 people

  35 mi WNW

• Rich County

  2,752 people

  54 mi NNW

• Daggett County

  956 people

  76 mi E

Distance to Salt Lake City and the nearest big city

Salt Lake City is 48.5 miles W of Summit County's internal point in a straight line. The nearest place of 100,000 or more is Salt Lake City, UT (population 217,783), 50.8 miles away. The nearest place of 10,000 or more is Evanston, WY (population 11,691), 26.8 miles away.

Summit County FIPS code

The FIPS code of Summit County is 49043: state code 49 for Utah plus county code 043. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $139,848.