113,207 people (2024 Census estimate, +5.6% since 2020)
420 square miles of land · 270 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.
20 active community water systems list Platte County in the area they serve, reporting 607,515 people served in all (a system that crosses county lines counts its whole population).
| KANSAS CITY PWS surface water · local government · MO1010415 | 553,295 served |
| MO AMERICAN PLATTE COUNTY groundwater · private · MO1010625 | 16,645 served |
| PLATTE CO PWSD 4 buys surface water · local government · MO1024478 | 9,552 served |
| PLATTE COUNTY CONS PWSD 1 buys surface water · local government · MO1024479 | 7,074 served |
| PLATTE CITY PWS buys surface water · local government · MO1010646 | 4,691 served |
| PLATTE COUNTY PWSD 6 buys groundwater · local government · MO1024480 | 2,095 served |
| WEATHERBY LAKE PWS buys surface water · local government · MO1010842 | 2,077 served |
| PLATTE CO PWSD 9 buys surface water · local government · MO1024483 | 1,860 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 124 people were held in Platte County's jail, in Vera's latest figure (2021), or 175 per 100,000 residents ages 15–64. In 2016 it was about 146.
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.
4 school districts have their office in Platte County. School taxes are usually the largest part of a property tax bill.
Spent $208.3 million — $184.6 million to run schools, about $15,414 per student, plus $15.5 million on buildings and equipment. Money in: $142.8 million local (mostly property tax), $62.5 million state, $15.5 million federal. Long-term debt: $142.8 million.
Spent $106.4 million — $53.4 million to run schools, about $12,475 per student, plus $47.6 million on buildings and equipment. Money in: $44.7 million local (mostly property tax), $23.8 million state, $7.4 million federal. Long-term debt: $101.4 million.
Spent $14.1 million — $11.3 million to run schools, about $15,246 per student, plus $2.7 million on buildings and equipment. Money in: $11.6 million local (mostly property tax), $2.8 million state, $187,000 federal.
Spent $7.9 million — $7.3 million to run schools, about $12,368 per student, plus $56,000 on buildings and equipment. Money in: $4.5 million local (mostly property tax), $3.8 million state, $969,000 federal. Long-term debt: $7.1 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 Platte County about $47.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
287 bridges in Platte County: 105 in good condition, 163 fair, and 19 poor (6.6%). “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.
| IS 29 S over OWL CR · built 1958 | 38,357 vehicles a day |
| IS 29 N over PLATTE RVR · built 1959 | 26,656 vehicles a day |
| IS 435 S over FIRST CR · built 1977 | 24,918 vehicles a day |
| IS 29 S over PLATTE RVR OVRFL · built 1950 | 18,026 vehicles a day |
| MO 9 S over BURLINGTON CR · built 1968 | 13,459 vehicles a day |
| MO 92 E over MISSOURI RVR RR UP RR · built 1955 | 10,684 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $103.1 million of work in Platte County in fiscal 2025, about $966 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 Missouri 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 Platte 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 Platte County built: brayden.ozark@gmail.com.
More of Missouri: the state government and every county in Missouri.
Nearby counties: Wyandotte County, KS (18 mi) · Clay County (19 mi) · Buchanan County (20 mi) · Leavenworth County, KS (20 mi) · Clinton County (25 mi) · Atchison County, KS (31 mi).