St. Lawrence County is a county in the U.S. state of New York. As of the 2020 census, the population was 108,505.^[1] The county seat is Canton.^[2] The county is named for the Saint Lawrence River. This was as named by early French explorer Jacques Cartier for the Christian saint Lawrence of Rome, as he visited the river on the saint's feast day. The county is part of the North Country region of the state.

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St. Lawrence County
County
The Raquette River in Colton, New York
Flag Seal
Location within the U.S. state of New York
New York's location within the U.S.
Coordinates: 44°30′N 75°04′W
Country	United States
State	New York
Founded	1802 (1802)
Named for	Saint Lawrence River
Seat	Canton
Area
• Total	2,821 sq mi (7,310 km2)
• Land	2,680 sq mi (6,900 km2)
• Water	141 sq mi (370 km2)  5.0%
Population  (2020)
• Total	108,505
• Density	38/sq mi (15/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	21st
Website	www.stlawco.org

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St. Lawrence County comprises the Ogdensburg-Massena, NY Micropolitan Statistical Area and is New York's largest county by area.

When counties were established by England in the Province of New York in 1683, the present St. Lawrence County was part of Albany County. This was an enormous territory, including the northern part of New York State as well as all of the present State of Vermont and, in theory, extending westward to the Pacific Ocean. The county was reduced in size on July 3, 1766, by the creation of Cumberland County, and further on March 16, 1770, by the creation of Gloucester County, both containing territory now in Vermont.

On March 12, 1772, what was left of Albany County was split into three parts, one remaining under the name Albany County. The other two were called Tryon County (later renamed Montgomery County) and Charlotte County (later renamed Washington County).

Tryon County contained the western portion (and, since no western boundary was specified, theoretically extended west to the Pacific). The eastern boundary of Tryon County was approximately five miles west of the present city of Schenectady, and the county included the western part of the Adirondack Mountains and the area west of the West Branch of the Delaware River. The area then designated as Tryon County included what are now 37 counties of New York State. The county was named for William Tryon, colonial governor of New York. Charlotte County contained the eastern portion of Albany County.

In 1784, following the peace treaty that ended the American Revolutionary War, the name "Charlotte County" was changed to Washington County to honor George Washington, the American Revolutionary War general and later President of the United States of America. Tryon County was changed to Montgomery County to honor the general, Richard Montgomery, who had captured several places in Canada and died trying to capture the city of Quebec. It replaced the name of the British governor, hated by the rebels.

In 1788, Clinton County was split off from Washington County. This was a much larger area than the present Clinton County, including part of what would later become St. Lawrence County, as well as several other counties or county parts of the present New York State.

In 1789, the size of Montgomery County was reduced by the splitting off of Ontario County from Montgomery. The actual area split off from Montgomery County was much larger than the present county, also including the present Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston, Monroe, Niagara, Orleans, Steuben, Wyoming, Yates, and part of Schuyler and Wayne Counties.

St. Lawrence County is part of Macomb's Purchase of 1791.

In 1791, Herkimer County was one of three counties split off from Montgomery (the other two being Otsego, and Tioga County). This was much larger than the present county, however, and was reduced by a number of subsequent splits. The first was the splitting off in 1794 of Onondaga County. This county was larger than the current Onondaga County, including the present Cayuga, Cortland, and part of Oswego Counties. This was followed by the splitting off in 1798 from Herkimer County of two portions: one, Oneida County, was larger than the current Oneida County, including the present Jefferson, Lewis, and part of Oswego Counties; another portion, together with a portion of Tioga County, was taken to form Chenango County.

In 1799, Clinton County was reduced in size by the splitting off of Essex County from Clinton County.

In 1802, parts of Clinton, Herkimer, and Montgomery counties were taken to form the new St. Lawrence County. At that time Ogdensburg was the county seat. In 1828 the county seat was moved to Canton. The selection of Canton as the county seat was a compromise by the state legislature to end competition between factions supporting Ogdensburg and Potsdam for the county seat.^[3]

According to the United States Census Bureau, the county has a total area of 2,821 square miles (7,310 km²), of which 2,680 square miles (6,900 km²) is land and 141 square miles (370 km²) (5.0%) is water.^[5]

It is the largest county by area in the state of New York. It is larger than either of the states of Rhode Island (1544.9 square miles) or the state of Delaware (2488.72 square miles). St. Lawrence County is part of the North Country region.

Part of the county is in the Adirondack Park. It includes much of the Oswegatchie River, Cranberry Lake and Lake Ozonia.

The Port of Ogdensburg in St. Lawrence County is the only U.S. port on the St. Lawrence Seaway. This waterway allows ships and vessels to pass through the St. Lawrence River and on to the Great Lakes. Ogdensburg Harbor Light is listed in the National Register of Historic Places, and in the National Register of Historic Places listings in St. Lawrence County, New York

As of the census^[10] of 2000, there were 113,931 people, 40,506 households, and 26,936 families residing in the county. The population density was 42 inhabitants per square mile (16/km²). There were 49,721 housing units at an average density of 18 units per square mile (6.9/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 only English, while 3.2% spoke French and 1.2% Spanish at home.

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.

Prior to the 1992 presidential election, St. Lawrence County was a traditionally Republican county, supporting the Democrats only in their sweep of New York State counties in 1964. From 1992 through the 2012 election, St. Lawrence County swung Democratic, posting double-digit victories for Democratic candidates, most notably in 1996 when Bill Clinton won the county by 28-point margin over Bob Dole. The first Republican victory in the county since 1988 came in 2016 when Donald Trump carried the county by an eight-point margin. In 2020, it was one of only a few counties in Upstate New York where Trump improved his margin, this time carrying it by over 10 points.

• List of counties in New York
• National Register of Historic Places listings in St. Lawrence County, New York
• St. Lawrence County Public Transportation