Delta County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 31,196.^[1] The county seat is Delta.^[2]

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Delta County
County
Egyptian Theatre (Delta, Colorado)
Location within the U.S. state of Colorado
Colorado's location within the U.S.
Coordinates: 38°52′N 107°52′W
Country	United States
State	Colorado
Founded	February 11, 1883
Named for	City of Delta, Colorado
Seat	Delta
Largest city	Delta
Area
• Total	1,149 sq mi (2,980 km2)
• Land	1,142 sq mi (2,960 km2)
• Water	6.5 sq mi (17 km2)  0.6%
Population  (2020)
• Total	31,196
• Density	27/sq mi (10/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	3rd
Website	www.deltacounty.com

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Delta County was created by the Colorado legislature on February 11, 1883, out of portions of central Gunnison County. The county was named from a delta of arable land at the mouth of the Uncompahgre River, where it flows into the Gunnison River.^[3]

According to the U.S. Census Bureau, the county has a total area of 1,149 square miles (2,980 km²), of which 1,142 square miles (2,960 km²) is land and 6.5 square miles (17 km²) (0.6%) is water.^[4]

At the 2000 census there were 27,834 people, 11,058 households, and 7,939 families living in the county. The population density was 24 people per square mile (9.3 people/km²). There were 12,374 housing units at an average density of 11 units per square mile (4.2 units/km²). The racial makeup of the county was 92.29% White, 0.52% Black or African American, 0.76% Native American, 0.32% Asian, 0.03% Pacific Islander, 4.25% from other races, and 1.83% from two or more races. 11.39% of the population were Hispanic or Latino of any race.^[10] Of the 11,058 households 29.00% had children under the age of 18 living with them, 60.30% were married couples living together, 7.90% had a female householder with no husband present, and 28.20% were non-families. 24.80% of households were one person and 12.40% were one person aged 65 or older. The average household size was 2.43 and the average family size was 2.89.

The age distribution was 24.00% under the age of 18, 6.30% from 18 to 24, 23.60% from 25 to 44, 26.50% from 45 to 64, and 19.70% 65 or older. The median age was 42 years. For every 100 females there were 100.80 males. For every 100 females age 18 and over, there were 98.60 males.

The median household income was $32,785 and the median family income was $37,748. Males had a median income of $31,348 versus $19,916 for females. The per capita income for the county was $17,152. About 8.50% of families and 12.10% of the population were below the poverty line, including 15.00% of those under age 18 and 9.60% of those age 65 or over.

Delta County votes predominantly Republican in national, state, and local elections. No Democratic presidential candidate has reached forty percent of Delta County's vote since Lyndon Johnson carried the county in 1964, and since 1920 Franklin D. Roosevelt in 1932 is the only other Democrat to gain a majority, although Roosevelt did win a plurality against Alf Landon in 1936.

Delta County is split between two house districts for the Colorado House of Representatives, House District 58 & House District 54.^[11] Prior to the redistricting, which took affect in the November 2022 election, Delta County was split by House District 54 & 61.^[12] The Current Representative for House District 58 is Marc Catlin, who carried the county in the election.^[13]

The local papers are the Delta County Independent and the Merchant Herald.

The county is served by Delta County Joint School District 50-J.

• Bibliography of Colorado
• Geography of Colorado
• History of Colorado
  • National Register of Historic Places listings in Delta County, Colorado
• Index of Colorado-related articles
• List of Colorado-related lists
  • List of counties in Colorado
• Outline of Colorado
  • Delta County Libraries
  • Delta County Memorial Hospital