31,094 people (2024 Census estimate, −0.4% since 2020)
1,795 square miles of land · 17 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.
19 active community water systems list Coos County in the area they serve, reporting 23,797 people served in all (a system that crosses county lines counts its whole population).
| BERLIN WATER WORKS surface water · local government · NH0231010 | 9,575 served |
| GROVETON WATER SYS groundwater · local government · NH1781010 | 2,650 served |
| GORHAM WATER AND SEWER DEPT surface water · local government · NH0921010 | 2,630 served |
| LANCASTER WATER DEPT surface water · local government · NH1291010 | 2,500 served |
| WHITEFIELD WATER groundwater · local government · NH2501010 | 1,640 served |
| COLEBROOK WATER WORKS groundwater · local government · NH0481010 | 1,300 served |
| ROSEBROOK WATER groundwater · private · NH0382010 | 1,050 served |
| CARROLL WATER WORKS groundwater · local government · NH0381010 | 875 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 19 people were held in Coos County's jail, in Vera's latest figure (2023), or 99 per 100,000 residents ages 15–64. In 2018 it was about 21.
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.
11 school districts have their office in Coos County. School taxes are usually the largest part of a property tax bill.
Spent $23.9 million — $23.5 million to run schools, about $23,015 per student, plus $351,000 on buildings and equipment. Money in: $8.8 million local (mostly property tax), $11.5 million state, $3.9 million federal. Long-term debt: $123,000.
Spent $27.4 million — $25.7 million to run schools, about $26,287 per student, plus $1.7 million on buildings and equipment. Money in: $12.1 million local (mostly property tax), $9.6 million state, $4.9 million federal.
Spent $9.6 million — $8.8 million to run schools, about $22,992 per student, plus $706,000 on buildings and equipment. Money in: $6.1 million local (mostly property tax), $3.4 million state, $588,000 federal.
Spent $6.8 million — $6.6 million to run schools, about $20,505 per student, plus $80,000 on buildings and equipment. Money in: $2.8 million local (mostly property tax), $2.9 million state, $1.2 million federal.
Spent $7.6 million — $7.2 million to run schools, about $22,864 per student, plus $289,000 on buildings and equipment. Money in: $4 million local (mostly property tax), $2.5 million state, $838,000 federal.
Spent $4 million — $2.4 million to run schools, about $19,850 per student, plus $244,000 on buildings and equipment. Money in: $2.1 million local (mostly property tax), $1.4 million state, $485,000 federal. Long-term debt: $99,000.
Spent $3.5 million — $3.4 million to run schools, about $38,236 per student, plus $55,000 on buildings and equipment. Money in: $2.6 million local (mostly property tax), $586,000 state, $296,000 federal.
Spent $2.5 million — $1.9 million to run schools, about $29,813 per student, plus $159,000 on buildings and equipment. Money in: $1.3 million local (mostly property tax), $982,000 state, $427,000 federal.
And 3 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 Coos County about $27 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
189 bridges in Coos County: 93 in good condition, 86 fair, and 10 poor (5.3%). “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.
| US 2 over PEA BROOK · built 1932 | 4,334 vehicles a day |
| CARLETON HILL ROAD over MOHAWK RIVER · built 1935 | 451 vehicles a day |
| NORTH ROAD over ANDROSCOGGIN RIVER · built 1900 | 281 vehicles a day |
| HILL ROAD over PERRY STREAM · built 1860 | 191 vehicles a day |
| CHICKWOLNEPY ROAD over CHICKWOLNEPY STREAM · built 1950 | 96 vehicles a day |
| STEARNS BROOK ROAD over STEARNS BROOK · built 1950 | 96 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $17.9 million of work in Coos County in fiscal 2025, about $574 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 Hampshire 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 Coos 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 Coos County built: brayden.ozark@gmail.com.
More of New Hampshire: the state government and every county in New Hampshire.
Nearby counties: Essex County, VT (22 mi) · Oxford County, ME (29 mi) · Caledonia County, VT (42 mi) · Franklin County, ME (48 mi) · Orleans County, VT (49 mi) · Carroll County (54 mi).