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Seneca, IL

View of Seneca, IL
Image credit: IvoShandor / CC BY-SA 3.0
Population
2,310
U.S. Census Population Estimates Program · 2025
Elevation
508 ft
Median Home Value
$227,500
U.S. Census American Community Survey 5-Year · 2024
Median Rent
$1,149/mo
U.S. Census American Community Survey 5-Year · 2024
Median Income
$86,830
U.S. Census American Community Survey 5-Year · 2024

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Seneca in context.

OverallBest places in IllinoisPopulation rankingHighest population places in IllinoisNearest larger communityMorris, Illinois11 miles away · 14,669 residents.

About Seneca

Seneca is a village spanning LaSalle and Grundy counties in northern Illinois, situated along the Illinois River. Noted historically for its shipyard contributions during World War II and today hosting three marinas on the river's south bank, the community of approximately 2,450 is served by Seneca Grade School District 170 and Seneca Township High School District 160.

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+100.0ratingOutskirts FitA+99.9rating

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