Sedgwick County is the northeasternmost of the 64 counties of the State of Colorado of the United States. The county was named for Fort Sedgwick, a military post along the Platte Trail, which was named for General John Sedgwick. The county population was 2,747 at U.S. Census 2000. The county seat is Julesburg.
There were 1,165 households out of which 26.40% had children under the age of 18 living with them, 59.10% were married couples living together, 6.60% had a female householder with no husband present, and 31.10% were non-families. 29.40% of all households were made up of individuals and 13.60% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.83.
In the county the population was spread out with 22.80% under the age of 18, 6.60% from 18 to 24, 23.50% from 25 to 44, 25.00% from 45 to 64, and 22.10% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 100.10 males. For every 100 females age 18 and over, there were 97.20 males.
The median income for a household in the county was $28,278, and the median income for a family was $33,953. Males had a median income of $25,463 versus $16,392 for females. The per capita income for the county was $16,125. About 7.80% of families and 10.00% of the population were below the poverty line, including 13.70% of those under age 18 and 4.20% of those age 65 or over.