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O'Fallon
City in Illinois, United States
Overview
O'Fallon, Illinois is a welcoming suburban city just east of St. Louis, known for its strong community spirit, family-friendly atmosphere, and excellent schools. The city blends small-town charm with modern conveniences, making it popular for both residents and visitors.
Geographic Context
Jurisdiction
United States
State
Illinois
Population
91,316
Time Zone
America/Chicago
Coordinates
38.59°, -89.91°
Key Metrics
Safety Score · estimate
75
Female Safety
78
LGBTQ+ Safety
65
Traffic Safety
70
Food Safety
95
Monthly Cost · estimate
$2,479
Local Cost
$1,530
Local Income
$3,100
Cashless
80
English
100
Temperature
13.0°C
Summer Avg
24.8°C
Winter Avg
0.3°C
Record High
42.5°C
Record Low
-23.0°C
Humidity
76%
Precipitation
1105 mm
Internet Speed
222 Mbps
Upload
23 Mbps
Latency
20 ms
City Vibrancy
15
Coworking
0
Cafes
4
Nightlife
3
Parks
8
Transport
0
Walk Score
0
Footways
—
Airport
BLV
Distance
9 km
Explore
Data sources
Source-backed data
World Air Quality Index - Latest available city-level air quality station measurement. Record updated 2025-12-05.
OpenStreetMap - Nearby amenities counted from OpenStreetMap-derived city extracts. Record updated 2025-12-06.
OpenStreetMap transport extract - Walkability, footway density, and airport access metrics derived from mapped transport features. Record updated 2025-12-05.
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.
Oyster List city price estimates - Price origins are unverified. Available generation methods include AI estimates; stored records do not identify a survey, observation period, or model for each price. Record updated 2026-01-14.
Oyster List AI-assisted estimates - Safety, lifestyle, income, and practical scores include model-assisted estimates. Stored records do not identify supporting observations for each score. Model-reported confidence: 78/100; this is not a measured accuracy score. Model: derived+gpt-4.1. Record updated 2026-03-26.
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