41,771 people (2024 Census estimate, +3.4% since 2020)
738 square miles of land · 57 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.
26 active community water systems list Delaware County in the area they serve, reporting 24,896 people served in all (a system that crosses county lines counts its whole population).
| GROVE MUNICIPAL SERVICES AUTH. surface water · local government · OK1021614 | 7,311 served |
| GRAND LAKE PWA groundwater · local government · OK1021691 | 2,800 served |
| JAY surface water · local government · OK1021674 | 2,482 served |
| KETCHUM PWA DELAWARE CO SYSTEM surface water · local government · OK1221638 | 1,805 served |
| SOUTH DELAWARE CO REGIONAL WATER AUTH. surface water · private · OK1221645 | 1,500 served |
| DELAWARE CO RWD #10 groundwater · local government · OK6002158 | 1,295 served |
| WEST SILOAM SPRINGS buys surface water · local government · OK3002109 | 877 served |
| COLCORD PWA buys surface water · local government · OK2002157 | 819 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 82 people were held in Delaware County's jail, in Vera's latest figure (2023), or 335 per 100,000 residents ages 15–64. In 2018 it was about 93.
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 Delaware County. School taxes are usually the largest part of a property tax bill.
Spent $32 million — $26.8 million to run schools, about $10,586 per student, plus $5.1 million on buildings and equipment. Money in: $17 million local (mostly property tax), $9.3 million state, $4.4 million federal. Long-term debt: $6.7 million.
Spent $24.4 million — $22.2 million to run schools, about $13,891 per student, plus $2.2 million on buildings and equipment. Money in: $6.9 million local (mostly property tax), $10.8 million state, $8.8 million federal. Long-term debt: $3.5 million.
Spent $11 million — $10 million to run schools, about $12,599 per student, plus $1 million on buildings and equipment. Money in: $2.2 million local (mostly property tax), $6.8 million state, $2.6 million federal. Long-term debt: $840,000.
Spent $10.4 million — $9.7 million to run schools, about $12,873 per student, plus $671,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $5.6 million state, $2.9 million federal. Long-term debt: $1 million.
Spent $2.4 million — $2.3 million to run schools, about $13,231 per student, plus $70,000 on buildings and equipment. Money in: $1 million local (mostly property tax), $1.1 million state, $562,000 federal.
Spent $2.1 million — $1.9 million to run schools, about $10,785 per student, plus $276,000 on buildings and equipment. Money in: $698,000 local (mostly property tax), $969,000 state, $774,000 federal. Long-term debt: $46,000.
Spent $2.8 million — $2.8 million to run schools, about $16,788 per student, plus $36,000 on buildings and equipment. Money in: $3.1 million local (mostly property tax), $261,000 state, $206,000 federal. Long-term debt: $1.8 million.
Spent $3 million — $2.9 million to run schools, about $18,144 per student, plus $66,000 on buildings and equipment. Money in: $599,000 local (mostly property tax), $1.6 million state, $567,000 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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Delaware County about $29.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Very High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
161 bridges in Delaware County: 58 in good condition, 76 fair, and 27 poor (16.8%). “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.
| E0250 over GRAND LAKE-HICKORY CREEK · built 1940 | 1,664 vehicles a day |
| IRR E0340 (2116C) over CREEK · built 1930 | 450 vehicles a day |
| IRR E0330 (2116C) over WHITEWATER CREEK · built 2018 | 450 vehicles a day |
| N4585 KENWOOD over DRY CREEK · built 2015 | 384 vehicles a day |
| N4605 over SPRING CREEK · built 1925 | 250 vehicles a day |
| E0310 over DUCK CREEK · built 1939 | 200 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $33.3 million of work in Delaware County in fiscal 2025, about $824 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 Delaware 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 Delaware County built: brayden.ozark@gmail.com.
More of Oklahoma: the state government and every county in Oklahoma.
Nearby counties: Mayes County (25 mi) · McDonald County, MO (30 mi) · Ottawa County (31 mi) · Benton County, AR (31 mi) · Craig County (34 mi) · Adair County (35 mi).