Sedalia is an unincorporated community and census-designated place (CDP) in Douglas County, Colorado, United States. The CDP population was 206 at the 2010 census. The Sedalia Post Office has the ZIP code 80135.
Sedalia is located in northwestern Douglas County at 39°26′16″N 104°57′51″W / 39.43778°N 104.96417°W / 39.43778; -104.96417 (39.437892, −104.964117), along U.S. Route 85, which leads 8 miles (13 km) southeast to Castle Rock, the county seat, and north 24 miles (39 km) to downtown Denver.
According to the United States Census Bureau, the Sedalia CDP has a total area of 1.4 square miles (3.5 km), all of it land. Sedalia is in the valley of Plum Creek, a north-flowing tributary of the South Platte River.
As of the census of 2000, there were 211 people, 94 households, and 54 families residing in the CDP. The population density was 152.2 people per square mile (58.6/km²). There were 99 housing units at an average density of 71.4 per square mile (27.5/km²). The racial makeup of the CDP was 93.84% White, 4.27% Asian, 1.90% from other races. Hispanic or Latino of any race were 4.27% of the population.
There were 94 households out of which 24.5% had children under the age of 18 living with them, 52.1% were married couples living together, 3.2% had a female householder with no husband present, and 41.5% were non-families. 35.1% of all households were made up of individuals and 3.2% had someone living alone who was 65 years of age or older. The average household size was 2.24 and the average family size was 2.91.
In the CDP, the population was spread out with 21.3% under the age of 18, 5.2% from 18 to 24, 32.2% from 25 to 44, 27.5% from 45 to 64, and 13.7% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 126.9 males. For every 100 females age 18 and over, there were 124.3 males.
The median income for a household in the CDP was $37,045, and the median income for a family was $40,000. Males had a median income of $41,042 versus $32,292 for females. The per capita income for the CDP was $15,528. None of the families and 4.2% of the population were living below the poverty line.