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Waterloo, IL

View of Waterloo, IL
Image credit: Nyttend / Public domain
Population
11,132
U.S. Census Population Estimates Program · 2025
Elevation
713 ft
Median Home Value
$249,500
U.S. Census American Community Survey 5-Year · 2024
Median Rent
$886/mo
U.S. Census American Community Survey 5-Year · 2024
Median Income
$98,711
U.S. Census American Community Survey 5-Year · 2024

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Waterloo in context.

OverallBest places in IllinoisPopulation rankingHighest population places in IllinoisNearest larger communityBelleville, Illinois15 miles away · 40,237 residents.

About Waterloo

Waterloo is a city and the county seat of Monroe County, Illinois, situated twenty miles south of St. Louis. Located on a high ridge that protects it from the periodic flooding of the nearby Mississippi River Valley, the community of approximately 11,100 features a historic downtown commercial district. Zoned within the Waterloo Community Unit School District 5, the city is bypassed to the west by Illinois Route 3.

Top Rating Signals

Highest current ratings for this town.

Lower County Wildfire Hazard Potential ClassA+100.0ratingLower Projected Late-Century County-Area Exposure to Sea-Level RiseA+100.0ratingLower FEMA County Wildfire Risk IndexA+99.1rating

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