Seneca, IL

View of Seneca, IL
Population
2,310
U.S. Census Population Estimates Program · 2025
Elevation
508 ft
USGS GNIS community points and 3DEP elevation · GNIS 2026-07-06; USGS 3DEP sampled 2026-07-23
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
General Quality
Overall rating out of 100

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About Seneca

Seneca is a quiet river town of about 2,400 residents, situated right along the Illinois River across LaSalle and Grundy counties. Originally settled in the 19th century as a stop along the historic Illinois and Michigan Canal and the railroad, the village has held onto its friendly, unhurried character. It is the kind of place where daily life is peaceful and open water is never more than a few minutes away.

Waterfront recreation is a big part of the local lifestyle. Residents enjoy neighborhood marinas, a free public boat launch, and direct access to the I&M Canal State Trail for walking and cycling. Families are served locally by Seneca Grade School and Seneca Township High School, giving students a close-knit community setting. With parks, a unique history tied to building naval ships during World War II, and an easy drive to larger nearby hubs like Morris and Ottawa, Seneca offers an appealing landing spot for anyone looking for classic small-town river living.

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