542,090 people (2024 Census estimate, +2.6% since 2020)
659 square miles of land · 823 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.
45 active community water systems list Plymouth County in the area they serve, reporting 548,666 people served in all (a system that crosses county lines counts its whole population).
| BROCKTON WATER DEPARTMENT surface water · local government · MA4044000 | 105,788 served |
| PLYMOUTH WATER DEPARTMENT groundwater · local government · MA4239000 | 47,100 served |
| WEIR RIVER WATER SYSTEM surface water · local government · MA4131000 | 45,339 served |
| MARSHFIELD WATER DEPARTMENT groundwater · local government · MA4171000 | 34,000 served |
| ABINGTON/ROCKLAND JOINT WTR. WORKS surface water · local government · MA4001000 | 33,387 served |
| MATTAPOISETT RIVER VALLEY W.D. buys groundwater · local government · MA4173001 | 29,600 served |
| BRIDGEWATER WATER DEPARTMENT groundwater · local government · MA4042000 | 28,633 served |
| WAREHAM FIRE DISTRICT groundwater · local government · MA4310000 | 20,102 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 1,038 people were held in Plymouth County's jail, in Vera's latest figure (2025). In 2020 it was about 669.
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.
30 school districts have their office in Plymouth County. School taxes are usually the largest part of a property tax bill.
Spent $411.9 million — $402.8 million to run schools, about $26,852 per student, plus $2.8 million on buildings and equipment. Money in: $2.1 million local (mostly property tax), $275 million state, $46.2 million federal. Long-term debt: $9.3 million.
Spent $192.2 million — $179.4 million to run schools, about $24,900 per student, plus $5.1 million on buildings and equipment. Money in: $122.2 million local (mostly property tax), $47.4 million state, $11.7 million federal. Long-term debt: $81.2 million.
Spent $102.6 million — $98.3 million to run schools, about $17,811 per student, plus $483,000 on buildings and equipment. Money in: $63.1 million local (mostly property tax), $48 million state, $7.1 million federal. Long-term debt: $41.9 million.
Spent $92.4 million — $88.5 million to run schools, about $23,068 per student, plus $1.2 million on buildings and equipment. Money in: $63.7 million local (mostly property tax), $23.9 million state, $4 million federal. Long-term debt: $31 million.
Spent $80.1 million — $74 million to run schools, about $19,488 per student, plus $2.2 million on buildings and equipment. Money in: $51.5 million local (mostly property tax), $25.5 million state, $5.3 million federal. Long-term debt: $35.4 million.
Spent $72.2 million — $66.9 million to run schools, about $18,701 per student, plus $496,000 on buildings and equipment. Money in: $32.9 million local (mostly property tax), $35.9 million state, $6 million federal. Long-term debt: $2.9 million.
Spent $71.5 million — $64.2 million to run schools, about $20,962 per student, plus $342,000 on buildings and equipment. Money in: $31.9 million local (mostly property tax), $28 million state, $5.5 million federal. Long-term debt: $49 million.
Spent $64.3 million — $59.8 million to run schools, about $21,092 per student, plus $1.7 million on buildings and equipment. Money in: $48.6 million local (mostly property tax), $13.5 million state, $2.2 million federal. Long-term debt: $49.3 million.
And 22 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 Plymouth County about $114.3 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.
288 bridges in Plymouth County: 82 in good condition, 189 fair, and 17 poor (5.9%). “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.
| ST 3 NB over WATER NORTH RIVER · built 1961 | 43,207 vehicles a day |
| ST 3 SB over WATER NORTH RIVER · built 1961 | 40,879 vehicles a day |
| ST 3 NB/PLGRM HWY over HWY FRANKLIN ST · built 1962 | 34,314 vehicles a day |
| US 44 HARDING ST over RR MBTA/CSX · built 1963 | 31,681 vehicles a day |
| ST 3 SB/PLGRM HWY over HWY FRANKLIN ST · built 1962 | 24,431 vehicles a day |
| HWY PLEASANT ST over ST 24 · built 1954 | 16,900 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $97.8 million of work in Plymouth County in fiscal 2025, about $184 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.
State election: Tuesday, November 3, 2026. Early voting: 2026-10-17 to 2026-10-30. Last day to register to vote: 2026-10-24. Mail ballot request deadline: 2026-10-27. Election Day: 2026-11-03. Last day for mailed ballots to arrive: 2026-11-06.
Source: Secretary of the Commonwealth, 2026 Information for Voters, p. 4 · Cambridge Election Commission, 2026 State Election guide (return deadlines) · Mass. General Laws ch. 54, sec. 93
The budget, property tax rates, audits, local officials and offices for Plymouth 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 Plymouth County built: brayden.ozark@gmail.com.
More of Massachusetts: the state government and every county in Massachusetts.
Nearby counties: Bristol County (24 mi) · Norfolk County (26 mi) · Suffolk County (28 mi) · Bristol County, RI (34 mi) · Barnstable County (35 mi) · Dukes County (42 mi).