Orange County, Vermont  Orange County is a county located in the U.S. state of Vermont. As of the 2010 census, the population was 28,936. Its shire town (county seat) is the town of Chelsea. Orange County was organized on February 2, 1781 as an original county within the state. According to the U.S. Census Bureau, the county has an area of , of which is land and (0.8%) is water. As of the census of 2000, the county had 28,226 people, 10,936 households, and 7,611 families. The population density was 41 people per square mile (16/km²). There were 13,386 housing units at an average density of 19 per square mile (8/km²). The county's racial makeup was 98.02% White, 0.24% Black or African American, 0.27% Native American, 0.35% Asian, 0.04% Pacific Islander, 0.13% from other races, and 0.95% from two or more races. 0.58% of the population were Hispanic or Latino of any race. 24.3% were of English, 12.8% French, 11.5% American, 10.8% Irish, 6.0% German and 5.5% French Canadian ancestry. 97.4% spoke English and 1.5% French as their first language. There were 10,936 households, of which 33.40% had children under the age of 18 living with them, 56.10% were married couples living together, 8.90% had a female householder with no husband present, and 30.40% were non-families. 23.40% of all households were made up of individuals and 9.20% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 2.97.  25.60% of the county's population was under age 18, 7.80% was from age 18 to 24, 28.20% was from age 25 to 44, 25.60% was from age 45 to 64, and 12.80% was age 65 or older. The median age was 39 years. For every 100 females, there were 99.20 males. For every 100 females age 18 and over, there were 96.60 males. The county's median household income was $39,855, and the median family income was $45,771.