Seneca, IL Profile: Facts, Map & Data


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Seneca, Illinois - Basic Facts

The Village of Seneca had a population of 2,454 as of July 1, 2017. Seneca ranks in the lower quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Seneca is located at latitude 41.2866 and longitude -88.6278 in LaSalle County. The formal boundaries for the Village of Seneca (see map below) encompass a land area of 6.56 sq. miles and a water area of 0.43 sq. miles. LaSalle County is in the Central time zone (GMT -6). The elevation is 509 feet.

The Village of Seneca (GNIS ID: ) has a P1 Census Class Code which indicates populated place that is also an incorporated place with the same name and the same census code. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The Village of Seneca is located within Township of Brookfield, a minor civil division (MCD) of LaSalle County.

Beneath the boundary map are tables with Seneca population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Seneca: Crotty.

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Village of Seneca, IL Boundary Map

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Boundary Maps: Township of Brookfield | LaSalle County | Illinois Counties

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Seneca, IL Data & Demographics (As of July 1, 2017)


Total Population 2,454
Daytime Population: Workers 892
Daytime Population: Residents 1,224
Total Daytime Population (TDP) 2,116
Ratio TDP/Total Population1 0.86
Population in Households 2,454
Population in Familes 2,073
Population in Group Qrtrs 0
Population Density2 374
Diversity Index3 17


Median Household Income $64,158
Average Household Income $75,771
Per Capita Income $28,100


Total Housing Units 951 (100%)
Owner Occupied HU 722 (75.9%)
Renter Occupied HU 178 (18.7%)
Vacant Housing Units 51 ( 5.4%)
Median Home Value $175,930
Average Home Value $205,636


Total Households 900
Average Household Size 2.73
Family Households 643
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.5% 0.0%
Households 0.52% 0.02%
Families 0.41% -0.09%
Median Household Income   1.67%
Per Capita Income   2.83%

Seneca, IL - Peer Comparisons by Rank and Percentile

The table below compares Seneca to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 469 66th
Population Density # 1156 16th
Diversity Index # 548 60th
Median Household Income # 334 76th
Per Capita Income # 563 59th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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