A town of 20,956. Nearly 10% of it is conserved land.
The 2 things Arnold does most differently from other towns.
10% of the town is conserved land, across 5 parks and preserves.
Be the first to start the conversation.
Nothing on the calendar.
Ordered by what stands out in Arnold. Another town gets a different order.
6.5 miles of trails across 5 parks and preserves.
| Biggest places to walk | Trails | Acres |
|---|---|---|
| 1. Strawberry Creek Nature Area | 1.4 mi | 114 |
| 2. Arnold City Park | 1.1 mi | 56 |
| 3. Pomme Creek Park | 0.3 mi | 104 |
Arnold beats the Missouri average on 5 of 32 CDC measures and trails it on 0.
| What stands out | Arnold | MO |
|---|---|---|
| Fewer older adults who have lost all their teeth | 11.1% | 15.8% |
| Fewer adults facing food insecurity | 10.8% | 13.7% |
Expected storm and flood damage is higher than in 70% of U.S. communities.
Arnold has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 23°, and about 10 inches of snow falls in a normal winter.
Most working residents leave Arnold for work: only 7% work in town. The top destinations are St. Louis (16%), Fenton (4%) and Maryland Heights (4%). Half commute less than 15 miles.
The public schools Arnold’s kids attend, from kindergarten through graduation, outperform 61% of Missouri’s districts on state tests and graduation. Among towns with similar incomes, they sit near the middle.
| School | Grades | Students | Grade |
|---|---|---|---|
| Rockport Heights Elem. | K–5 | 386 | B |
| Fox Elem. | K–5 | 355 | C+ |
| Sherwood Elem. | K–5 | 347 | B+ |
| St. Johns Lutheran School Private | PK–8 | 255 | |
| Holy Child Catholic School Private | PK–8 | 238 | |
| Fox Middle | 6–8 | 570 | C+ |
Arnold's reported crime rate is well below Missouri's. Most reported incidents are property crimes, mainly thefts. 15 violent crimes were reported in 2025.
The typical Arnold home is worth about $276,000, up 3.7% in a year, close to the Missouri typical home.
7 postcards, papers and photographs from public archives.
3 notable people were born in Arnold.
City in Missouri, United States
Arnold is a city in northeastern Jefferson County, Missouri, situated near the confluence of the Meramec and Mississippi rivers. A suburb of St. Louis, the city lies within the Greater St. Louis metropolitan statistical area. The population was 20,858 at the 2020 United States census, which makes it the most populous community in the county.
From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)
One town shares a border with Arnold.
