542,973 people (2024 Census estimate, +4.3% since 2020)
1,167 square miles of land · 465 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.
64 active community water systems list Adams County in the area they serve, reporting 708,670 people served in all (a system that crosses county lines counts its whole population).
| THORNTON CITY OF surface water · local government · CO0101150 | 226,465 served |
| WESTMINSTER CITY OF surface water · local government · CO0101170 | 202,078 served |
| SOUTH ADAMS COUNTY WSD buys surface water · local government · CO0101140 | 75,559 served |
| BRIGHTON CITY OF buys surface water · local government · CO0101025 | 56,304 served |
| NORTHGLENN CITY OF surface water · local government · CO0101115 | 48,927 served |
| CRESTVIEW WSD buys surface water · local government · CO0101040 | 23,756 served |
| NORTH WASHINGTON STREET WSD buys surface water · local government · CO0101105 | 14,500 served |
| FEDERAL HEIGHTS CITY OF buys surface water · local government · CO0101055 | 11,678 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 777 people were held in Adams County's jail, in Vera's latest figure (2025). In 2020 it was about 700.
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.
7 school districts have their office in Adams County. School taxes are usually the largest part of a property tax bill.
Spent $587.9 million — $527.2 million to run schools, about $14,748 per student, plus $34.1 million on buildings and equipment. Money in: $293.6 million local (mostly property tax), $291.7 million state, $52.6 million federal. Long-term debt: $459.1 million.
Spent $403.7 million — $246.6 million to run schools, about $10,856 per student, plus $129.3 million on buildings and equipment. Money in: $170.4 million local (mostly property tax), $157.7 million state, $21.8 million federal. Long-term debt: $585.1 million.
Spent $157.8 million — $142.8 million to run schools, about $17,838 per student, plus $10.4 million on buildings and equipment. Money in: $71.5 million local (mostly property tax), $69.9 million state, $22.3 million federal. Long-term debt: $135.1 million.
Spent $112.6 million — $102.7 million to run schools, about $14,491 per student, plus $1.7 million on buildings and equipment. Money in: $63.3 million local (mostly property tax), $50.5 million state, $15.2 million federal. Long-term debt: $154.9 million.
Spent $111.9 million — $102.9 million to run schools, about $18,079 per student, plus $7 million on buildings and equipment. Money in: $45.7 million local (mostly property tax), $39.9 million state, $20.3 million federal. Long-term debt: $62.8 million.
Spent $15.9 million — $14 million to run schools, about $10,775 per student, plus $555,000 on buildings and equipment. Money in: $9.4 million local (mostly property tax), $5.5 million state, $1.1 million federal. Long-term debt: $2.4 million.
Spent $22.5 million — $13 million to run schools, about $10,793 per student, plus $7.8 million on buildings and equipment. Money in: $7.4 million local (mostly property tax), $9.7 million state, $372,000 federal. Long-term debt: $23 million.
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 Adams County about $130.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
544 bridges in Adams County: 232 in good condition, 271 fair, and 41 poor (7.5%). “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 270 ML WBND over SOUTH PLATTE RIVER · built 1969 | 48,500 vehicles a day |
| I 270 ML EBND over SOUTH PLATTE RIVER · built 1969 | 48,500 vehicles a day |
| I 270 ML WBND over DITCH RD BURLINGTON CANA · built 1969 | 48,500 vehicles a day |
| I 270 EBND over E 64TH AVE BURLINGTON C · built 1969 | 48,500 vehicles a day |
| I 270 ML WBND over SH 265 ML UP RR BNSF RR · built 1969 | 48,500 vehicles a day |
| I 270 ML WBND over SERVICE RD BNSF RR · built 1970 | 48,500 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $552.7 million of work in Adams County in fiscal 2025, about $1,064 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.
General election: Tuesday, November 3, 2026. Ballots mailed to voters: 2026-10-02 to 2026-10-09. Drop boxes open: 2026-10-12. In-person voting at voter centers: 2026-10-19 to 2026-11-03. Last day to register and still get a ballot by mail: 2026-10-26. Last suggested day to mail your ballot back: 2026-10-26. Election Day: 2026-11-03. Last day to fix a signature problem: 2026-11-12.
Source: Colorado Secretary of State, Oct. 2, 2026 · Colorado Secretary of State, Sept. 23, 2026 · Colorado Secretary of State — Election Day FAQs
The budget, property tax rates, audits, local officials and offices for Adams 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 Adams County built: brayden.ozark@gmail.com.
More of Colorado: the state government and every county in Colorado.
Nearby counties: Arapahoe County (16 mi) · Denver County (30 mi) · Morgan County (38 mi) · Broomfield County (38 mi) · Elbert County (40 mi) · Weld County (47 mi).