41,273 people (2024 Census estimate, −2.2% since 2020)
10,427 square miles of land · 4 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 Sweetwater County in the area they serve, reporting 46,649 people served in all (a system that crosses county lines counts its whole population).
| ROCK SPRINGS, CITY OF buys surface water · local government · WY5601182 | 24,000 served |
| GREEN RIVER, CITY OF buys surface water · local government · WY5601181 | 10,500 served |
| WHITE MOUNTAIN W&S DISTRICT buys surface water · local government · WY5601391 | 3,000 served |
| LITTLE AMERICA HOTELS & RESORTS, INC- WY surface water · private · WY5600097 | 2,004 served |
| PIONEER MOBILE HOME PARK buys surface water · private · WY5601173 | 1,000 served |
| CLEARVIEW I&S DISTRICT buys surface water · local government · WY5600091 | 930 served |
| SKYLINE VILLAGE MOBILE HOME PK buys surface water · private · WY5601176 | 700 served |
| JAMESTOWN-RIO VISTA W&S DISTRICT buys surface water · local government · WY5600810 | 560 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 81 people were held in Sweetwater County's jail, in Vera's latest figure (2022), or 302 per 100,000 residents ages 15–64. In 2017 it was about 68.
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.
2 school districts have their office in Sweetwater County. School taxes are usually the largest part of a property tax bill.
Spent $102.2 million — $90.5 million to run schools, about $17,924 per student, plus $10.2 million on buildings and equipment. Money in: $65.4 million local (mostly property tax), $17.3 million state, $16.1 million federal.
Spent $49.5 million — $44.8 million to run schools, about $18,615 per student, plus $3.6 million on buildings and equipment. Money in: $37.6 million local (mostly property tax), $9.8 million state, $6.2 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: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Sweetwater County about $11.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
191 bridges in Sweetwater County: 48 in good condition, 129 fair, and 14 poor (7.3%). “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 530 SBL over UPRR / I-80 Bus · built 1978 | 9,974 vehicles a day |
| WYO 530 NBL over UPRR / I-80 Bus · built 1994 | 9,974 vehicles a day |
| WYO 530 SBL over Green River · built 1982 | 9,814 vehicles a day |
| I-80 EBL over Sw CR 53 (White Mtn Rd) · built 1966 | 7,912 vehicles a day |
| I-80 EBL over WYO 374 · built 1967 | 7,357 vehicles a day |
| I-80 EBL over WYO 377 · built 1964 | 6,916 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $76.4 million of work in Sweetwater County in fiscal 2025, about $1,808 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 Sweetwater 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 Sweetwater County built: brayden.ozark@gmail.com.
More of Wyoming: the state government and every county in Wyoming.
Nearby counties: Daggett County, UT (62 mi) · Moffat County, CO (80 mi) · Uinta County (91 mi) · Sublette County (93 mi) · Fremont County (97 mi) · Carbon County (100 mi).