PlainZIP

Seneca, IL

Single-footprint Census roll-up for Seneca, IL: 1 USPS ZIP, population 3,393. Open the primary ZIP for household income, housing tenure, and commute from ACS 2023 5-Year Estimates.

U.S. Census Bureau, SimpleMaps US ZIP Code Database, delivery-area ZIP coverage

ACS city ledger plate

Sheet SENECA-IL · Seneca, IL 1 ZIPs · 3,393 pop · #5313/25278 · LaSalle County

INC-HIGH · RANK-UPPER · ABOVE-PEER · BOOK-ONE · OWN-MID · POP-VILLAGE · SPREAD-UNK · HOME-MID

  • INC-HIGH $95,093
  • RANK-UPPER #5313/25278
  • ABOVE-PEER over Sheridan
  • BOOK-ONE 1 ZIP
  • OWN-MID 78% owners
  • POP-VILLAGE 3,393
  • SPREAD-UNK Single-ZIP book
  • HOME-MID $258,200

Nearest income peer: Sheridan, IL ( $8,307 income $)

Instrument codes from this city’s ACS household income, national rank, county-peer gap, ZIP book, owner tenure, population scale, intra-city income spread, and home-value band, not a moving recommendation.

Income neighbourhood around Seneca

Lowest/highest poles plus county-sharing cities nearest Seneca on average ZIP median household income. Full ladder: /cities.

median HH income

What this shows County-sharing peers only, not the full US city board. Open a near peer when the gap is small; open the poles when the mosaic is wide.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2026-08-25

National city placement

According to ACS 5-Year Estimates, Seneca, IL sits among US cities with an upper-quartile household income, on a village-scale population base, across a single-ZIP footprint.

Top 21%
household income vs 25,278 US cities
3,393
city population (Census)
1
USPS ZIP codes covered
$95,093
avg ZIP median income

Income percentile ranks this city's average ZIP median household income against 25,278 US cities with ACS income on at least one ZIP. Scale and ZIP-spread words come from Census population and USPS ZIP coverage.

High-income footprint on only 1 ZIP: the city page and the ZIP page nearly coincide. Headline income $95,093 and home value $258,200 should be read as near-neighborhood numbers ; bachelor's attainment averages 16.0%.

Owner-occupancy sits in a mixed band (78.0%) - check the ZIP page's tenure split before treating Seneca as a pure owner town.

Within Illinois, Mchenry is the closest lower-income city and Braidwood the closest higher-income city by average ZIP household income. Their 2 and 1 ZIP footprints are the immediate statewide comparison set for Seneca.

Population concentration

One ZIP, 61360, is all of Seneca

There is no split to weigh here: 61360 holds every one of Seneca's 3,393 ACS residents. City-level and ZIP-level numbers on this site are the same number twice, check the ZIP page for the income/tenure/commute breakdown.

Census ZBP business roll-up

Mid-pack ZBP load on Seneca's one ZIP

Citywide ZBP: 60 establishments, 512 employees , annual payroll $26,093k (~18 establishments per 1,000 residents) across 1 of 1 ZIPs. Peak business ZIP 61360 (60 units) ; leading NAICS Construction (10) · also Accommodation and food services · Wholesale trade .

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ZIP Codes in Seneca, IL

These ZIP codes sit in LaSalle County, which covers 25 ZIP codes in all; 1 of them fall in Seneca. See the LaSalle County roll-up →

Seneca sits in the upper half of LaSalle County on income: Ottawa, Streator and Peru report less, while Somonauk and Utica report more. Streator marks the far end of that range at $59,060, 38% below Seneca.

ZIP Code Population Median income Establishments Density
61360 3,393 $95,093 60 26
How we build city roll-ups · Guide: reading ZIP code data · BLS wages

Seneca roll-ups here are for informational purposes only and do not constitute financial or relocation advice. ACS and Census ZBP figures are estimates; confirm the current table against Census before a money or move decision involving Seneca, .