Arnold is a city in Jefferson County, Missouri, home to about 20,956 people across 12 square miles. Its ZIP code is 63010.
Homes sold for a median of $184 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Arnold. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Arnold’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)22 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO16 miles away |
| Nearest city of 1 million+ | Chicago, IL275 miles away |
Straight-line distances from the center of Arnold; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Arnold had 20,858 residents in the 2020 census, up 4% since 2000.
It’s the 36th largest of 1,060 towns in Missouri by population.
Jefferson County grew from 25,712 residents in 1900 to 226,739 in 2020.
Jefferson County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 22°F. About 43.5 inches of rain and melted snow fall in a typical year, with about 9 inches of snow.
Source: NOAA 1991–2020 climate normals, Festus, MO weather station (14 miles away).
41,900 jobs at 3,956 businesses in Jefferson County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
399 doctors and other health care providers list an office in Arnold.
Nearest hospitals
Providers with an office here
| Primary care doctors | 27 |
|---|---|
| Specialist doctors | 8 |
| Dentists | 43 |
| Nurse practitioners and physician assistants | 37 |
| Mental health providers | 111 |
| Physical and occupational therapists | 143 |
| Optometrists | 8 |
| Chiropractors | 22 |
| Pharmacies | 9 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (6 nearby)
Grocery stores (6 nearby)
Pharmacies (3 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 2.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Fox C-6. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Don Earl Early Childhood Ctr.Arnold | Pre-K | 125 | Public | 1.5 mi |
| Fox Elem.Arnold | K–5 | 355 | Public | 1.7 mi |
| Lone Dell Elem.Arnold | K–5 | 381 | Public | 1.6 mi |
| Meramec Heights Elem.Arnold | K–5 | 376 | Public | 3.4 mi |
| Richard Simpson Elem.Arnold | K–5 | 410 | Public | 1.7 mi |
| Rockport Heights Elem.Arnold | K–5 | 386 | Public | 1.6 mi |
| Sherwood Elem.Arnold | K–5 | 347 | Public | 1.0 mi |
| Fox MiddleArnold | 6–8 | 570 | Public | 1.7 mi |
| Ridgewood MiddleArnold | 6–8 | 567 | Public | 2.6 mi |
| Fox Sr.. HighArnold | 9–12 | 1,660 | Public | 1.6 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Holy Child Catholic SchoolArnold | Pre-K–8 | 191 | Roman Catholic | 0.5 mi |
| St Johns Lutheran SchoolArnold | Pre-K–8 | 173 | Lutheran Church–Missouri Synod | 1.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.