Arnold city, Missouri
Official LSAD Designation: Arnold city • Census GEOID: 2901972
• Jefferson County
Arnold city is an incorporated city in Jefferson County, Missouri. According to official records from the Census (2025), Arnold city had an estimated population of 20,994 residents. Official Census Bureau geographic records classify this community under LSAD designation Arnold city (GEOID 2901972).
Local Government Administration U.S. Census Bureau GMAF
City Of Arnold
Municipal
Official Title:
Finance Director
Address:
2101 JEFFCO BLVD, ARNOLD MO 63010-2746
County Of Jefferson
County
Official Title:
County Executive
Address:
PO BOX 100, HILLSBORO MO 63050-0100
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 20,994 | 2025 |
| Median Household Income | $78,370 | 2020-2024 |
| Median Home Value | $220,000 | 2020-2024 |
| Land Area | 11.49 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).