48,434 people (2024 Census estimate, +15.6% since 2020)
571 square miles of land · 85 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.
12 active community water systems list McClain County in the area they serve, reporting 24,375 people served in all (a system that crosses county lines counts its whole population).
| NEWCASTLE buys surface water · local government · OK2004704 | 7,900 served |
| PURCELL groundwater · local government · OK2004701 | 6,693 served |
| BLANCHARD buys surface water · local government · OK3004710 | 2,966 served |
| GOLDSBY WATER AUTH TRUST groundwater · local government · OK2004707 | 2,000 served |
| MCCLAIN CO RWD # 8 groundwater · local government · OK2004711 | 1,897 served |
| WAYNE groundwater · local government · OK2004702 | 688 served |
| WASHINGTON groundwater · local government · OK2004703 | 600 served |
| DIBBLE buys surface water · local government · OK3004709 | 550 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 65 people were held in McClain County's jail, in Vera's latest figure (2024), or 215 per 100,000 residents ages 15–64. In 2019 it was about 137.
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.
6 school districts have their office in McClain County. School taxes are usually the largest part of a property tax bill.
Spent $33.3 million — $23.6 million to run schools, about $9,158 per student, plus $9.5 million on buildings and equipment. Money in: $15.3 million local (mostly property tax), $12.3 million state, $3 million federal. Long-term debt: $5.8 million.
Spent $22.6 million — $18.9 million to run schools, about $8,447 per student, plus $3.6 million on buildings and equipment. Money in: $9.1 million local (mostly property tax), $12.3 million state, $2.7 million federal. Long-term debt: $6.2 million.
Spent $16.6 million — $14.5 million to run schools, about $9,979 per student, plus $1.9 million on buildings and equipment. Money in: $6 million local (mostly property tax), $9.3 million state, $2.4 million federal. Long-term debt: $3.4 million.
Spent $12.4 million — $10.8 million to run schools, about $8,997 per student, plus $1.5 million on buildings and equipment. Money in: $5.1 million local (mostly property tax), $7.1 million state, $1.4 million federal. Long-term debt: $4.9 million.
Spent $8.6 million — $7.3 million to run schools, about $10,211 per student, plus $1.3 million on buildings and equipment. Money in: $3.2 million local (mostly property tax), $4.6 million state, $1.7 million federal. Long-term debt: $1.9 million.
Spent $6 million — $5.6 million to run schools, about $12,425 per student, plus $408,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $3.1 million state, $1.5 million federal. Long-term debt: $570,000.
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 Low compared with other U.S. counties. FEMA estimates natural hazards cost McClain County about $25.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
242 bridges in McClain County: 99 in good condition, 132 fair, and 11 poor (4.5%). “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.
| I-35 over S.H. 39 UNDER · built 1968 | 14,950 vehicles a day |
| S.H. 74 over I-35 UNDER · built 1959 | 5,400 vehicles a day |
| N3095 over WALNUT CREEK · built 1927 | 2,400 vehicles a day |
| S.H. 24 over FINN CREEK · built 1969 | 300 vehicles a day |
| E1240 over STINSON CREEK · built 1985 | 100 vehicles a day |
| N3035 over BUFFALO CREEK · built 1985 | 100 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $14.1 million of work in McClain County in fiscal 2025, about $339 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 Oklahoma 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 McClain 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 McClain County built: brayden.ozark@gmail.com.
More of Oklahoma: the state government and every county in Oklahoma.
Nearby counties: Cleveland County (15 mi) · Garvin County (23 mi) · Grady County (25 mi) · Pottawatomie County (31 mi) · Oklahoma County (37 mi) · Murray County (42 mi).