Seneca, IL ZIP codes

3 ZIP/ZCTAs intersecting this Census place in LaSalle County.

ACS 2023 population

2,525

Median household income

$91,065

Median home value

$206,400

U.S. Census Bureau, ACS 2019–2023 5-year (vintage 2023). Geography: Census place Seneca (GEOID 1768640). Methodology

Combined population of ZIP/ZCTAs intersecting this place: 31,487 (3 ZIPs).

Combined population of ZIP/ZCTAs intersecting this place. Each intersecting ZIP contributes its full ZCTA population; overlap percents are descriptive only. This is not the Census place ACS headline above. Methodology

Map of Seneca, IL

Census place boundary and intersecting ZIP Code Tabulation Areas for Seneca, IL — Census place boundary for Seneca, IL. Intersecting ZCTAs may extend past the city limit. Not a USPS city limit. Boundaries: U.S. Census Bureau. Methodology · Data sources

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ZIP/ZCTA overlap with Seneca

Population overlap

Share of each ZIP/ZCTA’s population located within Seneca, based on ZIP Code Database place-overlap data. This is a population measure, not land-area overlap or the Census-place population.

604500.0%
613411.1%
6136068.4%
USPS primary city

ZIP Code Database place-overlap table, field percent_of_zip_population_in_place, keyed by place_geoid. Not ACS 2019–2023. Overlap vintage is the shipped overlap table and is separate from ACS. Methodology

ZIP codes intersecting Seneca

ZIP	City	County	Population	Income
60450	Morris	Grundy County	20,918	$81,716
61341	Marseilles	LaSalle County	7,249	$78,895
61360	Seneca	LaSalle County	3,320	$94,137