ZIP codes
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Seneca, IL Demographics & ZIP Codes
Seneca, Illinois demographics and median household income by ZIP code (in LaSalle County) — 1 ZIP codes — population 3,320 — median income $94,137 — avg. home value $240,800. Compare income, housing, and population across ZIP codes on US5.
Population
3,320
Median household income (avg.)
$94,137
125% of U.S. median
Average home value
$240,800
69% of U.S. median
Average rent
$842
72% of U.S. median
Median age (avg.)
41.8
Seneca demographics
Seneca, Illinois covers 1 ZIP code primarily in LaSalle County, with a combined ZIP-area population of about 3,320.
Across ZIP codes with age data, the average median age is about 41.8 years.
Median household income in Seneca
The average median household income across ZIP codes in Seneca, Illinois is about $94,137 — about 20% above the IL ZIP average ($78,143), and about 25% above the U.S. median ($75,149).
The highest median household income among listed ZIPs is about $94,137 in 61360.
Housing in Seneca
For housing in Seneca, Illinois, the average median home value is about $240,800 and the average median rent is about $842.
The most populous ZIP in this set is 61360 (about 3,320 residents). Use the table below to compare population, income, and home values across codes.
ZIP codes in Seneca
Sort by population, income, or home value. Click a column header to toggle ascending / descending.
| ZIP | City | County | State | Population ↓ | Income | Home value |
|---|---|---|---|---|---|---|
| 61360 | Seneca | LaSalle County | IL | 3,320 | $94,137 | $240,800 |
Frequently asked questions
What are the demographics of Seneca?
Seneca, Illinois has a combined ZIP-area population of about 3,320 across 1 ZIP codes (primarily LaSalle County). Browse the ZIP table below for population, income, and housing by code.
What is the median household income in Seneca?
The average median household income across ZIP codes in Seneca, Illinois is about $94,137, about 20% above the state ZIP average ($78,143), and about 25% above the U.S. median ($75,149). Average median home value is about $240,800.
How many ZIP codes are in Seneca?
Seneca, Illinois includes 1 ZIP codes on US5. Each row links to demographics, median income, and housing for that code.
Where can I find ZIP code demographics for Seneca?
This page lists ZIP codes in Seneca, Illinois with population, median household income, and home value. Select a ZIP for a full demographics profile.