Grangeville is the largest city in and the county seat of Idaho County, Idaho, United States, in the north central part of the state. Its population was 3,141 at the 2010 census, down from 3,228 in 2000. Geography According to the United States Census Bureau, the city has a total area of , all land. Grangeville is located on the Camas Prairie, with the mountains of the Nez Perce National Forest rising just to the south of the city. U.S. Route 95 passes along the western edge of the city as it travels north-south through the state. Idaho State Highway 13 has a terminus at U.S. 95 in Grangeville, and passes through the city as Main Street. The Idaho County Airport is located one nautical mile north of the central business district. Climate According to the Köppen climate classification system, Grangeville has a humid continental climate (Köppen Dfb). Demographics 2010 census As of the census of 2010, there were 3,141 people, 1,389 households, and 841 families living in the city. The population density was . There were 1,527 housing units at an average density of . The racial makeup of the city was 94.8% White, 0.2% African American, 1.4% Native American, 0.6% Asian, 0.1% Pacific Islander, 0.9% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 3.6% of the population. There were 1,389 households, of which 27.7% had children under the age of 18 living with them, 46.5% were married couples living together, 9.7% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 39.5% were non-families. 35.0% of all households were made up of individuals, and 15.5% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.83. The median age in the city was 44 years. 23.1% of residents were under the age of 18; 6.2% were between the ages of 18 and 24; 21.5% were from 25 to 44; 28.8% were from 45 to 64; and 20.3% were 65 years of age or older. The gender makeup of the city was 48.7% male and 51.3% female. 2000 census As of the census of 2000, there were 3,228 people, 1,333 households, and 857 families living in the city. The population density was . There were 1,474 housing units