According to the U.S. Census Bureau, the county has a total area of 1,700 square miles (4,400 km2), of which 1,692 square miles (4,380 km2) is land and 7.6 square miles (20 km2) (0.4%) is water.[5]
U.S. Decennial Census[7] 1790-1960[8] 1900-1990[9] 1990-2000[10] 2010-2020[1]
As of the census[11] of 2000, there were 43,941 people in the county, organized into 17,342 households and 10,890 families. The population density was 26 people per square mile (10 people/km2). There were 20,765 housing units at an average density of 12 units per square mile (4.6 units/km2). The racial makeup of the county was 87.31% White, 5.78% Native American, 0.40% Asian, 0.31% Black or African American, 0.05% Pacific Islander, 3.90% from other races, and 2.25% from two or more races. 10.40% of the population were Hispanic or Latino of any race.
There were 17,342 households, out of which 29.60% had children under the age of 18 living with them, 49.90% were married couples living together, 8.70% had a female householder with no husband present, and 37.20% were non-families. 24.80% of all households were made up of individuals, and 6.10% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.92.
In the county, the population was spread out, with 22.70% under the age of 18, 13.90% from 18 to 24, 29.00% from 25 to 44, 25.10% from 45 to 64, and 9.40% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 103.60 males. For every 100 females age 18 and over, there were 103.10 males.
The median income for a household in the county was $40,159, and the median income for a family was $50,446. Males had a median income of $32,486 versus $24,666 for females. The per capita income for the county was $21,534. 11.70% of the population and 6.70% of families were below the poverty line. Out of the total population, 9.30% of those under the age of 18 and 7.70% of those 65 and older were living below the poverty line.
In its early years La Plata County generally leaned towards the Democratic Party. Only Benjamin Harrison in 1888, and the three landslide victories of Theodore Roosevelt, Warren G. Harding and Herbert Hoover saw the county vote Republican before World War II. In the period between 1940 and 1988, however, the county – like Colorado generally – took a turn towards supporting the Republican Party, with the result that between 1940 and 2000 the only Democrat to obtain a majority in the county was Lyndon Johnson in 1964. Since John Kerry became the first candidate in sixteen years from either party to gain a majority in La Plata County in the 2004 election, the county has tended towards the Democratic Party: Barack Obama's 2008 share of the vote was the highest for a Democrat since Woodrow Wilson's 92 years prior. In the 2020 election, Joe Biden handily won majority of the vote in the county, with a higher share of the vote than the previous presidential elections.
United States presidential election results for La Plata County, Colorado[13]
