St. Lawrence County is a county in the U.S. state of New York. As of the 2010 census, the population was 111,944.
The county seat is Canton.
The county is named for the Saint Lawrence River, which in turn was named for the Christian saint Lawrence of Rome, on whose Feast day the river was visited by French explorer Jacques Cartier.
According to the U.S. Census Bureau, the county has a total area of 2,821 square miles (7,310 km), of which 2,680 square miles (6,900 km) is land and 141 square miles (370 km) (5.0%) is water. It is the largest county by area in New York. It is larger than the entire state of Rhode Island (1544.9 square miles) and the state of Delaware (2488.72 square miles).
Part of the County is in the Adirondack Park and includes much of the Oswegatchie River, Cranberry Lake and Lake Ozonia.
As of the census of 2000, there were 113,931 people, 40,506 households, and 26,936 families residing in the county. The population density was 42 people per square mile (16/km²). There were 49,721 housing units at an average density of 18 per square mile (7/km²). The racial makeup of the county was 94.51% White, 2.38% African American, 0.87% Native American, 0.71% Asian, 0.03% Pacific Islander, 0.69% from other races, and 0.51% from two or more races. Hispanic or Latino of any race were 1.79% of the population. 16.9% were of French, 16.1% Irish, 13.9% American, 11.6% English, 8.1% French Canadian, 7.9% German and 7.6% Italian ancestry according to Census 2000. 95.6% spoke English, 1.2% Spanish and 3.2% French as their first language.
There were 40,506 households out of which 31.80% had children under the age of 18 living with them, 51.50% were married couples living together, 10.30% had a female householder with no husband present, and 33.50% were non-families. 26.50% of all households were made up of individuals and 11.20% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 2.99.
In the county, the population was spread out with 23.40% under the age of 18, 13.80% from 18 to 24, 27.40% from 25 to 44, 22.40% from 45 to 64, and 13.00% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 103.30 males. For every 100 females age 18 and over, there were 102.10 males.
The median income for a household in the county was $30,356, and the median income for a family was $34,510. Males had a median income of $30,135 versus $24,253 for females. The per capita income for the county was $14,728. About 12.30% of families and 19.90% of the population were below the poverty line, including 21.30% of those under age 18 and 10.30% of those age 65 or over.