County Maps US

St. Lawrence County, New York

The largest of New York's 62 counties by land area.

CountyFIPS 36089

Within New York
St. Lawrence County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Canton, the county seat, located via the 2025 Census Gazetteer.

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Population
105,488
-2,694 (-2.5%) since 2020
Land area
2,680
square miles. A further 5.0% of the total area is water
Population density
39.4
people per square mile, computed rather than published
County seat
Canton
Seat of county government.
Established
1802
223 years ago
Largest city
Massena village
Population 9,898.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of St. Lawrence County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of St. Lawrence County, New York from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 789 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where St. Lawrence County ranks

Position among the 62 counties of New York, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn New YorkNationally
Population105,48827th of 62597th of 3,144
Land area2,680 sq mi1st of 62195th of 3,144
Population density39.4 per sq mi57th of 621,688th of 3,144
Median household income$62,85058th of 621,815th of 3,143

Full data for St. Lawrence County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population105,488Vintage 2025 Population Estimates
Population in 2020108,182Vintage 2025 Population Estimates
2020 estimates base?108,505Vintage 2025 Population Estimates
Land area2,680 sq mi2025 Gazetteer Files
Water area141.7 sq mi2025 Gazetteer Files
Total area2,821 sq mi2025 Gazetteer Files
Population density?39.4 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$62,850American Community Survey 2020-2024 5-Year Estimates
Median home value$121,900American Community Survey 2020-2024 5-Year Estimates
Median age39.3American Community Survey 2020-2024 5-Year Estimates
Households41,666American Community Survey 2020-2024 5-Year Estimates
Housing units51,970American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-142
992 births, 1,134 deaths
Net migration
-540
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering St. Lawrence County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Franklin CountyNew York67 mi46,500
Jefferson CountyNew York24 mi111,540
Herkimer CountyNew York17 mi59,219
Lewis CountyNew York16 mi26,479
Hamilton CountyNew York16 mi5,006

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 62 counties of New York

Open the interactive New York county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.