19,821 people (2024 Census estimate, +1.9% since 2020)
574 square miles of land · 35 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.
9 active community water systems list Adair County in the area they serve, reporting 13,188 people served in all (a system that crosses county lines counts its whole population).
| STILWELL surface water · local government · OK1020205 | 3,276 served |
| ADAIR CO RWD #3 buys surface water · local government · OK3000106 | 2,598 served |
| ADAIR CO RWD #1 (CHERRY TREE) buys surface water · local government · OK3000104 | 2,000 served |
| ADAIR CO RWD #2 buys surface water · local government · OK3000105 | 1,675 served |
| WESTVILLE UTILITY AUTHORITY buys surface water · local government · OK3000109 | 1,596 served |
| ADAIR CO RWD #4 buys surface water · local government · OK3000107 | 1,025 served |
| ADAIR CO RWD #5 surface water · local government · OK1021770 | 675 served |
| WATTS buys surface water · local government · OK3000108 | 316 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 73 people were held in Adair County's jail, in Vera's latest figure (2023), or 597 per 100,000 residents ages 15–64. In 2018 it was about 94.
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.
9 school districts have their office in Adair County. School taxes are usually the largest part of a property tax bill.
Spent $19.2 million — $17.3 million to run schools, about $12,441 per student, plus $1.8 million on buildings and equipment. Money in: $3.3 million local (mostly property tax), $10.3 million state, $6.7 million federal.
Spent $13.8 million — $12.4 million to run schools, about $12,778 per student, plus $1.4 million on buildings and equipment. Money in: $2.7 million local (mostly property tax), $7.4 million state, $3.7 million federal. Long-term debt: $630,000.
Spent $10.6 million — $8.7 million to run schools, about $13,462 per student, plus $2 million on buildings and equipment. Money in: $933,000 local (mostly property tax), $4.9 million state, $5 million federal.
Spent $3.8 million — $3.7 million to run schools, about $12,989 per student, plus $100,000 on buildings and equipment. Money in: $474,000 local (mostly property tax), $2.3 million state, $1.4 million federal.
Spent $3.6 million — $2.7 million to run schools, about $12,192 per student, plus $839,000 on buildings and equipment. Money in: $742,000 local (mostly property tax), $1.7 million state, $635,000 federal.
Spent $3.1 million — $2.9 million to run schools, about $14,709 per student, plus $151,000 on buildings and equipment. Money in: $371,000 local (mostly property tax), $1.7 million state, $1.6 million federal.
Spent $3.4 million — $2.7 million to run schools, about $15,368 per student, plus $710,000 on buildings and equipment. Money in: $913,000 local (mostly property tax), $1.4 million state, $1.1 million federal.
Spent $4 million — $3.6 million to run schools, about $22,547 per student, plus $444,000 on buildings and equipment. Money in: $525,000 local (mostly property tax), $1.5 million state, $3 million federal.
And 1 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 Adair County about $12.3 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
139 bridges in Adair County: 45 in good condition, 72 fair, and 22 poor (15.8%). “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.
| E0850 (0150C) over CREEK · built 1943 | 624 vehicles a day |
| E0850 (0150C) over CREEK · built 1943 | 624 vehicles a day |
| E0808 (0130C) over MULBERRY CREEK · built 1997 | 550 vehicles a day |
| N4671 (FAS 0104) over BARON FORK CREEK · built 1948 | 475 vehicles a day |
| E0630 (0101C) over LUNAR CREEK · built 1942 | 400 vehicles a day |
| N4740 (0148C) over EAGLE PASS CREEK · built 1972 | 280 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $12.6 million of work in Adair County in fiscal 2025, about $648 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 Adair 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 Adair County built: brayden.ozark@gmail.com.
More of Oklahoma: the state government and every county in Oklahoma.
Nearby counties: Cherokee County (19 mi) · Washington County, AR (25 mi) · Sequoyah County (28 mi) · Crawford County, AR (32 mi) · Delaware County (35 mi) · Benton County, AR (38 mi).