106,198 people (2024 Census estimate, −2.0% since 2020)
2,680 square miles of land · 40 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
40 active community water systems list St. Lawrence County in the area they serve, reporting 63,180 people served in all (a system that crosses county lines counts its whole population).
| MASSENA VILLAGE surface water · local government · NY4404390 | 16,729 served |
| OGDENSBURG CITY surface water · local government · NY4404394 | 10,064 served |
| POTSDAM VILLAGE surface water · local government · NY4404397 | 8,312 served |
| CANTON VILLAGE groundwater · local government · NY4404381 | 7,055 served |
| GOUVERNEUR surface water · local government · NY4404385 | 4,263 served |
| EAST LOUISVILLE WATER DISTRICT surface water · local government · NY4430133 | 3,235 served |
| NORFOLK WATER DISTRICT groundwater · local government · NY4404392 | 2,300 served |
| NORWOOD groundwater · local government · NY4404393 | 1,685 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 127 people were held in St. Lawrence County's jail, in Vera's latest figure (2026). In 2021 it was about 114.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
17 school districts have their office in St. Lawrence County. School taxes are usually the largest part of a property tax bill.
Spent $76.3 million — $59.3 million to run schools, about $24,135 per student, plus $12.3 million on buildings and equipment. Money in: $18 million local (mostly property tax), $46.4 million state, $9.1 million federal. Long-term debt: $22.2 million.
Spent $41.9 million — $37.5 million to run schools, about $25,521 per student, plus $2.2 million on buildings and equipment. Money in: $7.9 million local (mostly property tax), $32.3 million state, $5.8 million federal. Long-term debt: $20.5 million.
Spent $50.8 million — $46.3 million to run schools, about $31,578 per student, plus $1.7 million on buildings and equipment. Money in: $12.5 million local (mostly property tax), $35.1 million state, $5.2 million federal. Long-term debt: $34.8 million.
Spent $38.5 million — $33.7 million to run schools, about $25,384 per student, plus $3.6 million on buildings and equipment. Money in: $15.9 million local (mostly property tax), $20 million state, $2.9 million federal. Long-term debt: $11.7 million.
Spent $39.4 million — $31.5 million to run schools, about $27,618 per student, plus $6.5 million on buildings and equipment. Money in: $10.9 million local (mostly property tax), $21.9 million state, $2.4 million federal. Long-term debt: $14.1 million.
Spent $28.8 million — $25.2 million to run schools, about $25,359 per student, plus $699,000 on buildings and equipment. Money in: $5.5 million local (mostly property tax), $22.6 million state, $3.4 million federal. Long-term debt: $19.7 million.
Spent $30.2 million — $24.9 million to run schools, about $25,108 per student, plus $2.7 million on buildings and equipment. Money in: $7.5 million local (mostly property tax), $20.7 million state, $3.7 million federal. Long-term debt: $11.7 million.
Spent $19.3 million — $17.2 million to run schools, about $25,636 per student, plus $1.4 million on buildings and equipment. Money in: $5.4 million local (mostly property tax), $13.1 million state, $2.6 million federal. Long-term debt: $3.5 million.
And 9 more.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost St. Lawrence County about $31.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
313 bridges in St. Lawrence County: 193 in good condition, 102 fair, and 18 poor (5.8%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| RTE 812 over CAN.QUEENS HWY.2 ST.LAW · built 1960 | 3,033 vehicles a day |
| COUNTY ROAD 43 over DODGE CREEK · built 1983 | 1,155 vehicles a day |
| EDDY PYRITES ROAD over HARRISON CRK OVFL · built 1931 | 620 vehicles a day |
| RTE 58 over FISH CREEK · built 1933 | 522 vehicles a day |
| RTE 184 over FISH CREEK · built 1932 | 470 vehicles a day |
| RTE 184 over FISH CREEK · built 1932 | 425 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $50.2 million of work in St. Lawrence County in fiscal 2025, about $463 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for New York are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for St. Lawrence County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have St. Lawrence County built: brayden.ozark@gmail.com.
More of New York: the state government and every county in New York.
Nearby counties: Franklin County (38 mi) · Lewis County (52 mi) · Jefferson County (59 mi) · Hamilton County (64 mi) · Herkimer County (64 mi) · Essex County (69 mi).