40,981 people (2024 Census estimate, +0.8% since 2020)
365 square miles of land · 112 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.
16 active community water systems list Knox County in the area they serve, reporting 25,360 people served in all (a system that crosses county lines counts its whole population).
| MAINE WATER COMPANY CAMDEN & ROCKLAND surface water · private · ME0090300 | 21,315 served |
| VINALHAVEN WATER DISTRICT surface water · local government · ME0091550 | 1,053 served |
| MAINE WATER COMPANY WARREN DIVISION groundwater · private · ME0091565 | 815 served |
| NORTH HAVEN WATER DEPARTMENT surface water · local government · ME0091130 | 740 served |
| TENANTS HARBOR WATER DISTRICT groundwater · local government · ME0092335 | 378 served |
| PORT CLYDE WATER DISTRICT groundwater · local government · ME0091290 | 330 served |
| MAINE WATER COMPANY UNION DIVISION groundwater · private · ME0091537 | 238 served |
| MOUNTAINSIDE MOBILE HOME PARK groundwater · private · ME0002346 | 130 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 57 people were held in Knox County's jail, in Vera's latest figure (2019), or 236 per 100,000 residents ages 15–64. In 2014 it was about 68.
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.
8 school districts have their office in Knox County. School taxes are usually the largest part of a property tax bill.
Spent $36.8 million — $36 million to run schools, about $20,024 per student, plus $381,000 on buildings and equipment. Money in: $18.6 million local (mostly property tax), $16.5 million state, $3.6 million federal. Long-term debt: $2.4 million.
Spent $38.4 million — $36.2 million to run schools, about $23,445 per student, plus $895,000 on buildings and equipment. Money in: $28.3 million local (mostly property tax), $9.5 million state, $1.9 million federal. Long-term debt: $14.4 million.
Spent $18.1 million — $16.3 million to run schools, about $22,138 per student, plus $273,000 on buildings and equipment. Money in: $16.9 million local (mostly property tax), $2.1 million state, $560,000 federal. Long-term debt: $47.7 million.
Spent $14.8 million — $13.9 million to run schools, about $19,308 per student, plus $59,000 on buildings and equipment. Money in: $12.4 million local (mostly property tax), $2.1 million state, $400,000 federal. Long-term debt: $6.4 million.
Spent $6.4 million — $5.4 million to run schools, about $24,468 per student, plus $5,000 on buildings and equipment. Money in: $5.4 million local (mostly property tax), $1.1 million state, $491,000 federal.
Spent $5 million — $4.8 million to run schools, about $30,847 per student, plus $115,000 on buildings and equipment. Money in: $4 million local (mostly property tax), $689,000 state, $244,000 federal. Long-term debt: $135,000.
Spent $2.5 million — $2.4 million to run schools, about $48,320 per student, plus $28,000 on buildings and equipment. Money in: $2.4 million local (mostly property tax), $272,000 state, $4,000 federal. Long-term debt: $205,000.
Spent $82,000 — $82,000 to run schools, about $82,000 per student. Money in: $65,000 local (mostly property tax), $6,000 state, $0 federal.
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 Knox County about $11.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
54 bridges in Knox County: 15 in good condition, 30 fair, and 9 poor (16.7%). “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.
| MAIN ST over MEGUNTICOOK RIVER · built 1931 | 11,473 vehicles a day |
| HEALD HWY over ST GEORGE RIVER · built 1960 | 6,940 vehicles a day |
| PASCAL AV over GOOSE RIVER · built 1951 | 4,760 vehicles a day |
| WESTERN RD over FULLER BROOK · built 1947 | 2,150 vehicles a day |
| KNOWLTON ST over MEGUNTICOOK RIVER · built 1935 | 1,920 vehicles a day |
| MAIN ST over SAINT GEORGE RIVER · built 1939 | 846 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $25.1 million of work in Knox County in fiscal 2025, about $619 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 Maine 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 Knox 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 Knox County built: brayden.ozark@gmail.com.
More of Maine: the state government and every county in Maine.
Nearby counties: Lincoln County (24 mi) · Waldo County (30 mi) · Sagadahoc County (41 mi) · Kennebec County (44 mi) · Hancock County (49 mi) · Androscoggin County (59 mi).