Phillips County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 4,530.^[1] The county seat is Holyoke.^[2] The county was named in honor of R.O. Phillips, a secretary of the Lincoln Land Company, who organized several towns in Colorado.

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Phillips County
County
Phillips County Courthouse
Seal
Location within the U.S. state of Colorado
Colorado's location within the U.S.
Coordinates: 40.59°N 102.35°W / 40.59; -102.35
Country	United States
State	Colorado
Founded	March 27, 1889
Named for	R.O. Phillips
Seat	Holyoke
Largest city	Holyoke
Area
• Total	688 sq mi (1,780 km2)
• Land	688 sq mi (1,780 km2)
• Water	0.1 sq mi (0.3 km2)  0.02%
Population  (2020)
• Total	4,530
• Density	6.6/sq mi (2.5/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	4th
Website	phillipscounty.colorado.gov

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According to the U.S. Census Bureau, the county has a total area of 688 square miles (1,780 km²), of which 688 square miles (1,780 km²) is land and 0.1 square miles (0.26 km²) (0.02%) is water.^[3]

At the 2000 census there were 4,480 people, 1,781 households, and 1,239 families living in the county. The population density was 6 people per square mile (2.3 people/km²). There were 2,014 housing units at an average density of 3 units per square mile (1.2 units/km²). The racial makeup of the county was 93.04% White, 0.20% Black or African American, 0.29% Native American, 0.40% Asian, 0.02% Pacific Islander, 4.71% from other races, and 1.34% from two or more races. 11.76% of the population were Hispanic or Latino of any race.^[9] Of the 1,781 households 32.90% had children under the age of 18 living with them, 61.20% were married couples living together, 5.60% had a female householder with no husband present, and 30.40% were non-families. Of all households 27.50% were one person and 14.30% were one person aged 65 or older. The average household size was 2.47 and the average family size was 3.01.

The age distribution was 26.90% under the age of 18, 6.30% from 18 to 24, 25.30% from 25 to 44, 22.20% from 45 to 64, and 19.40% 65 or older. The median age was 40 years. For every 100 females there were 93.40 males. For every 100 females age 18 and over, there were 90.50 males.

The median household income was $32,177 and the median family income was $38,144. Males had a median income of $30,095 versus $18,682 for females. The per capita income for the county was $16,394. About 8.80% of families and 11.60% of the population were below the poverty line, including 14.70% of those under age 18 and 7.20% of those age 65 or over.

Phillips County has historically had a Republican majority. It has not been carried by a Democratic presidential nominee since Jimmy Carter in 1976. Michael Dukakis has been the only Democrat since to receive over one-third of the county's ballots during a major drought in 1988.

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