Logan County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 22,709. The county seat is Sterling. The county was named for General John A. Logan.
According to the U.S. Census Bureau, the county has a total area of 1,845 square miles (4,780 km), of which 1,839 square miles (4,760 km) is land and 6.3 square miles (16 km) (0.3%) is water.
As of the census of 2000, there were 20,504 people, 7,551 households, and 5,066 families residing in the county. The population density was 11 people per square mile (4/km²). There were 8,424 housing units at an average density of 5 per square mile (2/km²). The racial makeup of the county was 91.65% White, 2.05% Black or African American, 0.64% Native American, 0.40% Asian, 0.07% Pacific Islander, 3.77% from other races, and 1.43% from two or more races. 11.90% of the population were Hispanic or Latino of any race.
There were 7,551 households out of which 31.90% had children under the age of 18 living with them, 54.80% were married couples living together, 8.60% had a female householder with no husband present, and 32.90% were non-families. 28.50% of all households were made up of individuals and 12.40% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.02.
In the county, the population was spread out with 24.70% under the age of 18, 10.80% from 18 to 24, 28.30% from 25 to 44, 21.70% from 45 to 64, and 14.50% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 112.00 males. For every 100 females age 18 and over, there were 114.60 males.
The median income for a household in the county was $32,724, and the median income for a family was $42,241. Males had a median income of $28,155 versus $21,110 for females. The per capita income for the county was $16,721. About 9.00% of families and 12.20% of the population were below the poverty line, including 13.40% of those under age 18 and 10.90% of those age 65 or over.