Clinton County is a county in the north-easternmost corner of the state of New York, in the United States and bordered by Canada. As of the 2010 United States Census, the population was 82,128. Its county seat is the city of Plattsburgh. The county lies just south of the border with the Canadian province of Quebec.
Clinton County lies at the northeast corner of New York state. Its northern border abuts the Canadian province of Quebec. Its eastern border abuts the state of Vermont (across Lake Champlain). The encompassing region is referred to as the Adirondack Coast.
The Saranac River flows easterly through the central part of the county, discharging into Lake Champlain at Plattsburgh, and the Great Chazy River flows northeastward through the upper part of the county, discharging into Lake Champlain at Coopersville. The Ausable River forms a large part of the southern county line. The county’s highest point is Lyon Mountain, in the town of Dannemora, at 3,830′ (1167m) ASL. According to the US Census Bureau, the county has a total area of 1,117.53 square miles (2,894.4 km), of which 1,037.85 square miles (2,688.0 km) is land and 79.67 square miles (206.3 km) (7.1%) is water.
As of the 2000 United States Census, there were 79,894 people, 29,423 households, and 19,272 families in the county. The population density was 77.0/sqmi (29.7/km²). There were 33,091 housing units at an average density of 31.9/sqmi (12.3/km²). The racial makeup of the county was 93.33% White, 3.58% Black or African American, 0.36% Native American, 0.67% Asian, 0.02% Pacific Islander, 1.10% from other races, and 0.93% from two or more races. 2.46% of the population were Hispanic or Latino of any race. 23.7% were of French, 15.0% French Canadian, 12.5% American, 11.8% Irish, 7.6% English and 5.5% German ancestry according to Census 2000. 94.1% spoke English, 2.8% French and 1.7% Spanish as their first language.
There were 29,423 households out of which 32.00% had children under the age of 18 living with them, 51.00% were married couples living together, 10.20% had a female householder with no husband present, and 34.50% were non-families. 26.30% of all households were made up of individuals and 10.00% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.98.
The county population contained 23.00% under the age of 18, 12.40% from 18 to 24, 30.60% from 25 to 44, 22.10% from 45 to 64, and 11.90% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 104.90 males. For every 100 females age 18 and over, there were 104.60 males.
The median household income was $37,028, and the median income for a family was $45,732. Males had a median income of $33,788 versus $25,520 for females. The per capita income for the county was $17,946. About 9.40% of families and 13.90% of the population were below the poverty line, including 15.30% of those under age 18 and 11.40% of those age 65 or over.