322,433 people (2024 Census estimate, +2.5% since 2020)
695 square miles of land · 464 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.
199 active community water systems list Rockingham County in the area they serve, reporting 199,157 people served in all (a system that crosses county lines counts its whole population).
| AQUARION WATER/NH groundwater · private · NH1051010 | 34,000 served |
| PORTSMOUTH WATER WORKS surface water · local government · NH1951010 | 33,000 served |
| SALEM WATER DEPT surface water · local government · NH2051010 | 21,080 served |
| DERRY WATER DEPT buys surface water · local government · NH0611010 | 17,528 served |
| SEABROOK WATER DEPT groundwater · local government · NH2111010 | 14,000 served |
| EXETER WATER DEPT surface water · local government · NH0801010 | 12,236 served |
| PEASE TRADE PORT groundwater · state · NH1951020 | 9,900 served |
| HAMPSTEAD AREA WATER buys surface water · private · NH1031010 | 7,153 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 136 people were held in Rockingham County's jail, in Vera's latest figure (2019), or 65 per 100,000 residents ages 15–64. In 2014 it was about 307.
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.
32 school districts have their office in Rockingham County. School taxes are usually the largest part of a property tax bill.
Spent $87.3 million — $85.7 million to run schools, about $20,750 per student, plus $851,000 on buildings and equipment. Money in: $66.3 million local (mostly property tax), $19.7 million state, $3.3 million federal. Long-term debt: $4.7 million.
Spent $92.8 million — $71.8 million to run schools, about $19,887 per student, plus $17.4 million on buildings and equipment. Money in: $62.4 million local (mostly property tax), $18 million state, $4.1 million federal. Long-term debt: $102.1 million.
Spent $77 million — $69.8 million to run schools, about $21,048 per student, plus $6.8 million on buildings and equipment. Money in: $54.5 million local (mostly property tax), $17.7 million state, $3 million federal.
Spent $96.4 million — $74.3 million to run schools, about $23,702 per student, plus $145,000 on buildings and equipment. Money in: $57.6 million local (mostly property tax), $32.5 million state, $5.6 million federal.
Spent $59 million — $55.6 million to run schools, about $18,446 per student, plus $1.8 million on buildings and equipment. Money in: $46.1 million local (mostly property tax), $13.9 million state, $1.2 million federal. Long-term debt: $34 million.
Spent $62.9 million — $62.4 million to run schools, about $25,059 per student, plus $445,000 on buildings and equipment. Money in: $44.9 million local (mostly property tax), $14.7 million state, $2.9 million federal.
Spent $63.7 million — $59.7 million to run schools, about $24,821 per student, plus $914,000 on buildings and equipment. Money in: $49.3 million local (mostly property tax), $13.3 million state, $2.1 million federal. Long-term debt: $17.1 million.
Spent $37.6 million — $34.6 million to run schools, about $24,731 per student, plus $937,000 on buildings and equipment. Money in: $29.2 million local (mostly property tax), $6.7 million state, $1.9 million federal. Long-term debt: $2.7 million.
And 24 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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Rockingham County about $89.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
309 bridges in Rockingham County: 200 in good condition, 87 fair, and 22 poor (7.1%). “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.
| NH 33 over WINNICUT RIVER · built 1959 | 17,736 vehicles a day |
| US 1 over CSX · built 1935 | 15,436 vehicles a day |
| US 1 over CSX(ABD) · built 1936 | 14,314 vehicles a day |
| NH 1A over HAMPTON RIVER · built 1949 | 9,402 vehicles a day |
| MAPLEWOOD AVENUE over NORTH MILL POND · built 1940 | 5,829 vehicles a day |
| BRIDGE STREET over SPICKET RIVER · built 1900 | 4,883 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $161 million of work in Rockingham County in fiscal 2025, about $512 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 Rockingham 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 Rockingham County built: brayden.ozark@gmail.com.
More of New Hampshire: the state government and every county in New Hampshire.
Nearby counties: Strafford County (21 mi) · Essex County, MA (27 mi) · Hillsborough County (32 mi) · Merrimack County (36 mi) · York County, ME (37 mi) · Middlesex County, MA (38 mi).