97,954 people (2024 Census estimate, +4.3% since 2020)
722 square miles of land · 136 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.
18 active community water systems list St. Croix County in the area they serve, reporting 45,010 people served in all (a system that crosses county lines counts its whole population).
| HUDSON WATERWORKS groundwater · local government · WI6560087 | 18,558 served |
| NEW RICHMOND WATERWORKS groundwater · local government · WI6560126 | 10,824 served |
| BALDWIN WATERWORKS groundwater · local government · WI6560119 | 4,440 served |
| SOMERSET WATERWORKS groundwater · local government · WI6560137 | 3,334 served |
| HAMMOND WATERWORKS groundwater · local government · WI6560121 | 1,884 served |
| ROBERTS WATERWORKS groundwater · local government · WI6560134 | 1,872 served |
| WOODVILLE WATERWORKS groundwater · local government · WI6560138 | 1,386 served |
| GLENWOOD CITY WATERWORKS groundwater · local government · WI6560120 | 1,102 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 107 people were held in St. Croix County's jail, in Vera's latest figure (2025). In 2020 it was about 79.
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.
6 school districts have their office in St. Croix County. School taxes are usually the largest part of a property tax bill.
Spent $89.6 million — $80.7 million to run schools, about $15,006 per student, plus $2.3 million on buildings and equipment. Money in: $61.7 million local (mostly property tax), $41.8 million state, $6.9 million federal. Long-term debt: $73.4 million.
Spent $53.8 million — $46.9 million to run schools, about $13,193 per student, plus $300,000 on buildings and equipment. Money in: $23.2 million local (mostly property tax), $35.4 million state, $5.5 million federal. Long-term debt: $46.7 million.
Spent $35.1 million — $24.7 million to run schools, about $13,245 per student, plus $7.5 million on buildings and equipment. Money in: $14.5 million local (mostly property tax), $17.6 million state, $3.2 million federal. Long-term debt: $42.6 million.
Spent $25.7 million — $22.1 million to run schools, about $12,716 per student, plus $595,000 on buildings and equipment. Money in: $9.4 million local (mostly property tax), $16.4 million state, $2.5 million federal. Long-term debt: $31.2 million.
Spent $24 million — $21 million to run schools, about $14,336 per student, plus $239,000 on buildings and equipment. Money in: $11.5 million local (mostly property tax), $13.2 million state, $2.2 million federal. Long-term debt: $28 million.
Spent $11.4 million — $8.2 million to run schools, about $13,077 per student, plus $1.4 million on buildings and equipment. Money in: $3.8 million local (mostly property tax), $7.5 million state, $1.2 million federal. Long-term debt: $7.6 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 St. Croix County about $36 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
297 bridges in St. Croix County: 173 in good condition, 114 fair, and 10 poor (3.4%). “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.
| IH 94 EB over EAU GALLE RIVER · built 1958 | 17,800 vehicles a day |
| LRD 11TH ST over IH 94-USH 12-STH 35 · built 1973 | 13,600 vehicles a day |
| CTH A over WILLOW RIVER · built 1980 | 9,200 vehicles a day |
| USH 63 over BR WILLOW RIVER · built 1962 | 4,800 vehicles a day |
| STH 65 S over STH 35 · built 1992 | 4,200 vehicles a day |
| CTH K over BR WILLOW RIVER · built 1935 | 1,300 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $12.8 million of work in St. Croix County in fiscal 2025, about $136 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 Wisconsin 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 St. Croix 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 St. Croix County built: brayden.ozark@gmail.com.
More of Wisconsin: the state government and every county in Wisconsin.
Nearby counties: Pierce County (21 mi) · Washington County, MN (22 mi) · Dunn County (27 mi) · Polk County (30 mi) · Ramsey County, MN (32 mi) · Dakota County, MN (39 mi).