Sullivan County is a county in the U.S. state of New York. As of the 2010 census, the population was 77,547. The county seat is Monticello. The county’s name honors Major General John Sullivan, who was a hero in the American Revolutionary War.
According to the U.S. Census Bureau, the county has a total area of 997 square miles (2,580 km), of which 968 square miles (2,510 km) is land and 29 square miles (75 km) (2.9%) is water.
Sullivan County is in the southern part of New York State, southeast of Binghamton and southwest of Albany. It is separated from Pennsylvania along its southwest boundary by the Delaware River.
The county, which starts about 70 miles northwest of New York City, is in the Catskill Mountains. Its northeastern corner is within the Catskill Park.
The highest point in the county is a 3,118-foot (950 m) peak unofficially known as Beech Mountain, near Hodge Pond, a subsidiary summit to Mongaup Mountain across the Ulster County line. The lowest point is along the Delaware River.
As of the census of 2000, there were 73,966 people, 27,661 households, and 18,311 families residing in the county. The population density was 76 people per square mile (29/km²). There were 44,730 housing units at an average density of 46 per square mile (18/km²). The racial makeup of the county was 85.31% White, 8.51% Black or African American, 0.27% Native American, 1.12% Asian, 0.04% Pacific Islander, 2.89% from other races, and 1.87% from two or more races. 9.25% of the population were Hispanic or Latino of any race. 16.6% were of German, 13.9% Irish, 12.5% Italian, 7.3% American and 6.2% English ancestry according to Census 2000. 86.6% spoke English, 7.4% Spanish and 1.0% German as their first language. A small population of Russians, late twentieth-century immigrants, live in the villages.
There were 27,661 households out of which 31.30% had children under the age of 18 living with them, 50.10% were married couples living together, 11.40% had a female householder with no husband present, and 33.80% were non-families. 27.90% of all households were made up of individuals and 11.40% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.05.
In the county, the population was spread out with 24.90% under the age of 18, 7.30% from 18 to 24, 28.10% from 25 to 44, 25.40% from 45 to 64, and 14.30% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 103.60 males. For every 100 females age 18 and over, there were 102.80 males.
The median income for a household in the county was $36,998, and the median income for a family was $43,458. Males had a median income of $36,110 versus $25,754 for females. The per capita income for the county was $18,892. About 11.60% of families and 17.40% of the population were below the poverty line, including 21.60% of those under age 18 and 10.70% of those age 65 or over.