County Maps US

Summit County, Utah

A county in Utah, ranked 10 of 29 by population.

CountyFIPS 49043

Within Utah
Summit County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Coalville, the county seat, located via the 2025 Census Gazetteer.

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Population
43,141
+663 (+1.6%) since 2020
Land area
1,871
square miles. A further 0.5% of the total area is water
Population density
23.1
people per square mile, computed rather than published
County seat
Coalville
Seat of county government.
Established
1854
171 years ago
Largest city
Park City city
Population 8,573 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Summit County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Summit County, Utah from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 489 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Summit County ranks

Position among the 29 counties of Utah, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn UtahNationally
Population43,14110th of 291,133rd of 3,144
Land area1,871 sq mi18th of 29307th of 3,144
Population density23.1 per sq mi8th of 292,124th of 3,144
Median household income$138,1141st of 2917th of 3,143

Full data for Summit County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population43,141Vintage 2025 Population Estimates
Population in 202042,478Vintage 2025 Population Estimates
2020 estimates base?42,356Vintage 2025 Population Estimates
Land area1,871 sq mi2025 Gazetteer Files
Water area10.1 sq mi2025 Gazetteer Files
Total area1,881 sq mi2025 Gazetteer Files
Population density?23.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$138,114American Community Survey 2020-2024 5-Year Estimates
Median home value$1,067,700American Community Survey 2020-2024 5-Year Estimates
Median age41.5American Community Survey 2020-2024 5-Year Estimates
Households15,730American Community Survey 2020-2024 5-Year Estimates
Housing units26,549American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+226
419 births, 193 deaths
Net migration
-338
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 8 areas bordering Summit County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Uinta CountyWyoming70 mi20,728
Duchesne CountyUtah65 mi20,856
Wasatch CountyUtah57 mi38,514
Morgan CountyUtah55 mi13,383
Salt Lake CountyUtah18 mi1,220,916
Rich CountyUtah17 mi2,687
Daggett CountyUtah13 mi934
Sweetwater CountyWyoming2.5 mi41,267

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 29 counties of Utah

Open the interactive Utah county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.