Lincoln County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 5,467. The county seat is Hugo. The county obtains its name in memory of President Abraham Lincoln.
According to the U.S. Census Bureau, the county has a total area of 2,586 square miles (6,700 km), of which 2,578 square miles (6,680 km) is land and 8.8 square miles (23 km) (0.3%) is water.
The main watersheds include the Arikaree and Republican Rivers in the northern part of the county and the Big Sandy, Rush, and Horse Creeks in the southern part of the county. Big Sandy and Rush Creeks ultimately drain into the Arkansas River.
As of the census of 2000, there were 6,087 people, 2,058 households, and 1,389 families residing in the county. The population density was 2 people per square mile (1/km²). There were 2,406 housing units at an average density of 1 per square mile (0/km²). The racial makeup of the county was 86.30% White, 4.96% Black or African American, 0.94% Native American, 0.56% Asian, 0.03% Pacific Islander, 5.65% from other races, and 1.56% from two or more races. 8.53% of the population were Hispanic or Latino of any race.
There were 2,058 households out of which 33.70% had children under the age of 18 living with them, 55.30% were married couples living together, 8.40% had a female householder with no husband present, and 32.50% were non-families. 29.00% of all households were made up of individuals and 13.00% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 3.04.
In the county, the population was spread out with 23.90% under the age of 18, 7.10% from 18 to 24, 33.00% from 25 to 44, 21.80% from 45 to 64, and 14.30% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 130.90 males. For every 100 females age 18 and over, there were 140.70 males.
The median income for a household in the county was $31,914, and the median income for a family was $39,738. Males had a median income of $25,742 versus $22,188 for females. The per capita income for the county was $15,510. About 8.10% of families and 11.70% of the population were below the poverty line, including 14.40% of those under age 18 and 11.50% of those age 65 or over.