266,892 people (2024 Census estimate, +14.5% since 2020)
587 square miles of land · 455 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.
84 active community water systems list Canyon County in the area they serve, reporting 208,192 people served in all (a system that crosses county lines counts its whole population).
| NAMPA CITY OF groundwater · local government · ID3140080 | 100,200 served |
| CALDWELL CITY OF groundwater · local government · ID3140013 | 78,740 served |
| MIDDLETON CITY OF groundwater · local government · ID3140074 | 13,190 served |
| PARMA CITY OF groundwater · local government · ID3140089 | 2,250 served |
| WILDER CITY OF groundwater · local government · ID3140138 | 1,690 served |
| CALDWELL HOUSING AUTHORITY groundwater · private · ID3140012 | 1,100 served |
| GREENLEAF CITY OF groundwater · private · ID3140041 | 846 served |
| MELBA CITY OF groundwater · local government · ID3140070 | 648 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 433 people were held in Canyon County's jail, in Vera's latest figure (2023), or 263 per 100,000 residents ages 15–64. In 2018 it was about 430.
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.
8 school districts have their office in Canyon County. School taxes are usually the largest part of a property tax bill.
Spent $154.3 million — $149.2 million to run schools, about $11,136 per student, plus $3.7 million on buildings and equipment. Money in: $23.9 million local (mostly property tax), $99.9 million state, $34.8 million federal. Long-term debt: $32.4 million.
Spent $101.5 million — $92.1 million to run schools, about $9,310 per student, plus $3.7 million on buildings and equipment. Money in: $24.8 million local (mostly property tax), $73.2 million state, $21.3 million federal. Long-term debt: $133.7 million.
Spent $62.3 million — $61.1 million to run schools, about $11,104 per student, plus $771,000 on buildings and equipment. Money in: $8.2 million local (mostly property tax), $41 million state, $17.8 million federal. Long-term debt: $3.1 million.
Spent $40.5 million — $39.3 million to run schools, about $9,092 per student, plus $746,000 on buildings and equipment. Money in: $8.3 million local (mostly property tax), $31.2 million state, $4.4 million federal. Long-term debt: $28.5 million.
Spent $11.8 million — $10.1 million to run schools, about $9,762 per student, plus $1 million on buildings and equipment. Money in: $3.2 million local (mostly property tax), $8.2 million state, $2 million federal. Long-term debt: $5.8 million.
Spent $7.9 million — $7.4 million to run schools, about $8,975 per student, plus $293,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $6.9 million state, $1.1 million federal. Long-term debt: $6.4 million.
Spent $8 million — $7.3 million to run schools, about $11,059 per student, plus $468,000 on buildings and equipment. Money in: $1.4 million local (mostly property tax), $5.2 million state, $2.1 million federal. Long-term debt: $3.4 million.
Spent $5 million — $4.5 million to run schools, about $12,885 per student, plus $397,000 on buildings and equipment. Money in: $1.2 million local (mostly property tax), $3.2 million state, $1 million federal. Long-term debt: $3.8 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 Low compared with other U.S. counties. FEMA estimates natural hazards cost Canyon County about $36.1 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.
291 bridges in Canyon County: 86 in good condition, 199 fair, and 6 poor (2.1%). “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.
| NHS 7773;10TH AVE over CITY ST;UPRR;CALDWELL OP · built 1956 | 19,500 vehicles a day |
| BLAINE ST over OLD INDIAN CREEK CHANNEL · built 1966 | 5,400 vehicles a day |
| STC 7787;PLYMOUTH over BOISE RIVER & CANAL · built 1922 | 2,100 vehicles a day |
| SMA 7733;KIMBALL A over INDIAN CREEK · built 1933 | 2,000 vehicles a day |
| STC 8317;DUFF LANE over WILLOW CREEK · built 1983 | 750 vehicles a day |
| STC 3851;HEXON RD over BOISE RIVER · built 1954 | 560 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $31.3 million of work in Canyon County in fiscal 2025, about $135 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 Idaho 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 Canyon 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 Canyon County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Payette County (26 mi) · Ada County (26 mi) · Gem County (34 mi) · Malheur County, OR (54 mi) · Boise County (56 mi) · Washington County (57 mi).