Delta County, Colorado

A county in Colorado, ranked 18 of 64 by population.

CountyFIPS 08029

Within Colorado

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

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Population: 32,178; +1,116 (+3.6%) since 2020
Land area: 1,142; square miles. A further 0.6% of the total area is water
Population density: 28.2; people per square mile, computed rather than published
County seat: Delta; Seat of county government.
Established: 1883; 142 years ago
Largest city: Delta city; Population 9,802.

Satellite view

Aerial imagery of Delta 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 Delta County, Colorado 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 661 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 Delta County ranks

Position among the 64 counties of Colorado, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

Measure	Value	In Colorado	Nationally
Population	32,178	18th of 64	1,393rd of 3,144
Land area	1,142 sq mi	40th of 64	543rd of 3,144
Population density	28.2 per sq mi	19th of 64	1,981st of 3,144
Median household income	$57,774	49th of 64	2,279th of 3,143

Full data for Delta County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
Measure	Value	Source and vintage
Population	32,178	Vintage 2025 Population Estimates
Population in 2020	31,062	Vintage 2025 Population Estimates
2020 estimates base?	31,203	Vintage 2025 Population Estimates
Land area	1,142 sq mi	2025 Gazetteer Files
Water area	6.5 sq mi	2025 Gazetteer Files
Total area	1,149 sq mi	2025 Gazetteer Files
Population density?	28.2 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$57,774	American Community Survey 2020-2024 5-Year Estimates
Median home value	$343,200	American Community Survey 2020-2024 5-Year Estimates
Median age	48.1	American Community Survey 2020-2024 5-Year Estimates
Households	12,959	American Community Survey 2020-2024 5-Year Estimates
Housing units	15,025	American 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: -121; 306 births, 427 deaths
Net migration: +5; More people moved in than moved out.

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

The 3 areas bordering Delta 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 area	State	Shared border	Population
Mesa County	Colorado	79 mi	162,845
Montrose County	Colorado	47 mi	44,591
Gunnison County	Colorado	38 mi	17,439

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

All 64 counties of Colorado

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

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