69,632 people (2024 Census estimate, +5.5% since 2020)
960 square miles of land · 73 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.
120 active community water systems list Mason County in the area they serve, reporting 56,906 people served in all (a system that crosses county lines counts its whole population).
| SHELTON CITY OF groundwater · local government · WA5378170 | 15,273 served |
| BELFAIR WATER DISTRICT 1 groundwater · local government · WA5305350 | 4,432 served |
| LAKE CUSHMAN SYSTEM 5 groundwater · private · WA5303529 | 3,675 served |
| TIMBERLAKE COMMUNITY CLUB INC groundwater · private · WA5388370 | 2,337 served |
| WASHINGTON CORRECTIONS CENTER groundwater · state · WA5393063 | 2,223 served |
| ALDERBROOK WATER CO groundwater · local government · WA5301050 | 2,154 served |
| LAKE LIMERICK WATER groundwater · private · WA5344150 | 2,148 served |
| LAKELAND VILLAGE WATER groundwater · private · WA5345090 | 2,120 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 87 people were held in Mason County's jail, in Vera's latest figure (2021), or 216 per 100,000 residents ages 15–64. In 2016 it was about 131.
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.
7 school districts have their office in Mason County. School taxes are usually the largest part of a property tax bill.
Spent $85.8 million — $79.8 million to run schools, about $17,578 per student, plus $2.1 million on buildings and equipment. Money in: $14 million local (mostly property tax), $59.4 million state, $14.5 million federal. Long-term debt: $57 million.
Spent $42.7 million — $39.9 million to run schools, about $17,296 per student, plus $1.1 million on buildings and equipment. Money in: $7.4 million local (mostly property tax), $31.2 million state, $5.7 million federal. Long-term debt: $50.1 million.
Spent $15.1 million — $14.3 million to run schools, about $13,673 per student, plus $826,000 on buildings and equipment. Money in: $1 million local (mostly property tax), $14.9 million state, $1.4 million federal.
Spent $18.2 million — $14.9 million to run schools, about $19,599 per student, plus $1.9 million on buildings and equipment. Money in: $5 million local (mostly property tax), $9.6 million state, $2.1 million federal. Long-term debt: $20.9 million.
Spent $9.1 million — $7.6 million to run schools, about $21,882 per student, plus $1.3 million on buildings and equipment. Money in: $2 million local (mostly property tax), $4.9 million state, $1.3 million federal.
Spent $4.3 million — $3.9 million to run schools, about $16,166 per student. Money in: $1.8 million local (mostly property tax), $2.9 million state, $672,000 federal. Long-term debt: $9.2 million.
Spent $4.4 million — $3.5 million to run schools, about $18,005 per student, plus $742,000 on buildings and equipment. Money in: $932,000 local (mostly property tax), $2.5 million state, $986,000 federal. Long-term debt: $290,000.
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 Mason County about $44.3 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Low; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
136 bridges in Mason County: 77 in good condition, 55 fair, and 4 poor (2.9%). “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.
| US 101 over MATLOCK RD · built 1973 | 18,182 vehicles a day |
| Agate Loop Rd over CAMPBELL CREEK · built 1950 | 257 vehicles a day |
| W. Bulb Farm Rd. over CLOQUALLUM CREEK · built 1961 | 62 vehicles a day |
| NO DATA ENTERED over LENA CREEK · built 1964 | 25 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $18.9 million of work in Mason County in fiscal 2025, about $287 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 Washington 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 Mason 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 Mason County built: brayden.ozark@gmail.com.
More of Washington: the state government and every county in Washington.
Nearby counties: Kitsap County (32 mi) · Thurston County (33 mi) · Grays Harbor County (35 mi) · Jefferson County (35 mi) · Pierce County (52 mi) · Island County (60 mi).