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Jefferson County
City in Illinois, United States
Overview
Jefferson County, Illinois, is a tranquil Midwest region with Mount Vernon as its busy centerpiece. Visitors enjoy a charming downtown, friendly communities, and easy access to regional parks and heritage sites. The area blends small-town warmth with important conveniences.
Geographic Context
Jurisdiction
United States
State
Illinois
Population
32,977
Time Zone
America/Chicago
Coordinates
38.30°, -88.92°
Key Metrics
Safety Score
60
Female Safety
65
LGBTQ+ Safety
45
Traffic Safety
75
Food Safety
90
Monthly Cost
$2,073
Local Cost
$1,132
Local Income
$2,600
Cashless
85
English
99
Temperature
12.9°C
Summer Avg
24.5°C
Winter Avg
0.4°C
Record High
42.6°C
Record Low
-22.9°C
Humidity
77%
Precipitation
1123 mm
Internet Speed
37 Mbps
Upload
166 Mbps
Latency
12 ms
City Vibrancy
—
Coworking
0
Cafes
0
Nightlife
0
Parks
0
Transport
0
Walk Score
0
Footways
—
Airport
MVN
Distance
6 km
Explore
Frequently Asked Questions
Data sources
Source-backed data
NASA POWER - Climate normals and monthly weather measurements rendered as city weather metrics. Updated 2026-03-22.
World Air Quality Index - Latest available city-level air quality station measurement. Updated 2025-12-05.
Ookla Open Data - Internet speed aggregates for 2024Q3 from 2 tests. Updated 2025-12-05.
OpenStreetMap - Nearby amenities counted from OpenStreetMap-derived city extracts. Updated 2025-12-06.
OpenStreetMap transport extract - Walkability, footway density, and airport access metrics derived from mapped transport features. Updated 2025-12-05.
Oyster List city price model - City price estimates calibrated from local price surveys and jurisdiction-level cost signals. Updated 2026-01-14.
Estimated data
Oyster List AI-assisted estimates - Safety, lifestyle, income, and practical scores are model-assisted estimates derived from source-backed country and city signals. Confidence 77/100.
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