Prairie City is a city in Grant County, Oregon, United States. The population was 909 at the 2010 census. The community was incorporated by the Oregon Legislative Assembly on February 23, 1891.
Prairie City is in eastern Oregon at the upper end of the John Day River valley. It is about 50 miles (80 km) southwest of Baker City by highway and 13 miles (21 km) east of John Day along U.S. Route 26 in Grant County. Strawberry Mountain in the Strawberry Mountain Wilderness of the Malheur National Forest is directly south of the city.
According to the United States Census Bureau, the city has a total area of 0.99 square miles (2.56 km), all land.
As of the census of 2010, there were 909 people, 402 households, and 257 families residing in the city. The population density was 918.2 inhabitants per square mile (354.5/km). There were 476 housing units at an average density of 480.8 per square mile (185.6/km). The racial makeup of the city was 94.6% White, 0.1% African American, 1.3% Native American, 0.1% Asian, 0.2% Pacific Islander, 0.3% from other races, and 3.3% from two or more races. Hispanic or Latino of any race were 3.1% of the population.
There were 402 households of which 24.9% had children under the age of 18 living with them, 53.7% were married couples living together, 7.2% had a female householder with no husband present, 3.0% had a male householder with no wife present, and 36.1% were non-families. 32.1% of all households were made up of individuals and 17% had someone living alone who was 65 years of age or older. The average household size was 2.18 and the average family size was 2.69.
The median age in the city was 49.8 years. 20.4% of residents were under the age of 18; 5% were between the ages of 18 and 24; 18.9% were from 25 to 44; 30.2% were from 45 to 64; and 25.6% were 65 years of age or older. The gender makeup of the city was 49.3% male and 50.7% female.
At the census of 2000, the median income for a household in the city was $31,354, and the median income for a family was $35,893. Males had a median income of $31,771 versus $24,500 for females. The per capita income for the city was $16,278. About 10.6% of families and 14.7% of the population were below the poverty line, including 17.4% of those under age 18 and 9.4% of those age 65 or over.