80,410 people (2024 Census estimate, +0.1% since 2020)
5,341 square miles of land · 15 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.
25 active community water systems list Natrona County in the area they serve, reporting 76,954 people served in all (a system that crosses county lines counts its whole population).
| CASPER, CITY OF buys surface water · local government · WY5601415 | 59,000 served |
| MILLS, CITY OF groundwater (surface-influenced) · local government · WY5600036 | 4,050 served |
| BAR NUNN, TOWN OF buys surface water · local government · WY5600067 | 4,000 served |
| EVANSVILLE, TOWN OF surface water · local government · WY5600018 | 2,873 served |
| VISTA WEST WATER COMPANY buys surface water · local government · WY5600069 | 1,600 served |
| PIONEER WATER & SEWER DISTRICT buys surface water · local government · WY5600828 | 1,500 served |
| SANDY LAKE ESTATES I&S DISTRICT buys surface water · private · WY5601581 | 450 served |
| NATRONA COUNTY INT'L AIRPORT buys surface water · local government · WY5600079 | 423 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 200 people were held in Natrona County's jail, in Vera's latest figure (2023), or 395 per 100,000 residents ages 15–64. In 2018 it was about 263.
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.
1 school district has its office in Natrona County. School taxes are usually the largest part of a property tax bill.
Spent $242.8 million — $222.6 million to run schools, about $16,870 per student, plus $18.1 million on buildings and equipment. Money in: $81.1 million local (mostly property tax), $145.7 million state, $39.9 million federal.
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 Natrona County about $32.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
135 bridges in Natrona County: 45 in good condition, 85 fair, and 5 poor (3.7%). “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.
| WYO 220 over Casper Canal · built 1967 | 3,090 vehicles a day |
| Na Cnty Rd 412 over Hogback Draw · built 1929 | 165 vehicles a day |
| Hereford Lane over I-25 · built 1960 | 136 vehicles a day |
| Na Cnty Rd 110 over South Fork Powder River · built 1977 | 53 vehicles a day |
| Na Cnty Rd 102 over Badwater Creek · built 1940 | 22 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $52.5 million of work in Natrona County in fiscal 2025, about $657 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 Wyoming 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 Natrona 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 Natrona County built: brayden.ozark@gmail.com.
More of Wyoming: the state government and every county in Wyoming.
Nearby counties: Converse County (63 mi) · Johnson County (74 mi) · Washakie County (77 mi) · Carbon County (88 mi) · Fremont County (93 mi) · Hot Springs County (99 mi).