32,650 people (2024 Census estimate, −2.6% since 2020)
324 square miles of land · 101 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.
26 active community water systems list Seneca County in the area they serve, reporting 24,830 people served in all (a system that crosses county lines counts its whole population).
| SENECA FALLS surface water · local government · NY4901198 | 9,400 served |
| WATERLOO VILLAGE surface water · local government · NY4901199 | 7,000 served |
| SENECA COUNTY WATER DISTRICT #1 buys surface water · local government · NY4912215 | 1,820 served |
| BORDER CITY WATER DISTRICT buys surface water · local government · NY4911740 | 1,600 served |
| OVID VILLAGE surface water · local government · NY4901195 | 990 served |
| INTERLAKEN VILLAGE groundwater · local government · NY4901194 | 650 served |
| CAYUGA LAKE WATER DISTRICT # 3 buys surface water · local government · NY4930009 | 432 served |
| JUNIUS WATER DISTRICT #1 buys surface water · local government · NY4930001 | 400 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 63 people were held in Seneca County's jail, in Vera's latest figure (2026). In 2021 it was about 39.
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.
4 school districts have their office in Seneca County. School taxes are usually the largest part of a property tax bill.
Spent $61.5 million — $40.4 million to run schools, about $26,742 per student, plus $15 million on buildings and equipment. Money in: $14.7 million local (mostly property tax), $32.7 million state, $3.6 million federal. Long-term debt: $21 million.
Spent $32.8 million — $29.3 million to run schools, about $23,297 per student, plus $749,000 on buildings and equipment. Money in: $13.9 million local (mostly property tax), $21.1 million state, $3.8 million federal. Long-term debt: $22.3 million.
Spent $26.8 million — $23.8 million to run schools, about $35,185 per student, plus $2.1 million on buildings and equipment. Money in: $10.4 million local (mostly property tax), $16.1 million state, $2.6 million federal. Long-term debt: $10.1 million.
Spent $17 million — $12 million to run schools, about $25,926 per student, plus $1.2 million on buildings and equipment. Money in: $6.5 million local (mostly property tax), $7 million state, $1.3 million federal. Long-term debt: $2.8 million.
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: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Seneca County about $9.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
60 bridges in Seneca County: 19 in good condition, 25 fair, and 16 poor (26.7%). “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 5 over CAY & SEN CANAL · built 1932 | 12,332 vehicles a day |
| RTE 31 over ERIE CANAL · built 1949 | 1,853 vehicles a day |
| RTE 89 over 90IX RTE I90 · built 1953 | 1,304 vehicles a day |
| GORHAM STREET over SENECA RIVER · built 1916 | 900 vehicles a day |
| GILBERT ROAD over TOMMY CREEK · built 1983 | 723 vehicles a day |
| YELLOW TAVERN RD over KENDIG CREEK · built 1950 | 722 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $9.5 million of work in Seneca County in fiscal 2025, about $281 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 Seneca 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 Seneca County built: brayden.ozark@gmail.com.
More of New York: the state government and every county in New York.
Nearby counties: Yates County (17 mi) · Cayuga County (20 mi) · Ontario County (25 mi) · Schuyler County (26 mi) · Tompkins County (29 mi) · Wayne County (32 mi).