Map of Seneca village, Illinois

Seneca is a village in LaSalle and Grundy counties in the U.S. state of Illinois. The population was 2,353 at the 2020 census, down from 2,371 at the 2010 census.

The LaSalle County portion of Seneca is part of the Ottawa Micropolitan Statistical Area, while the small portion that lies in Grundy County is part of the Chicago–Naperville–Joliet Metropolitan Statistical Area.

Seneca village overview:
Name:	Seneca village
LSAD Code:	47
LSAD Description:	village (suffix)
State:	Illinois
County:	Grundy County, LaSalle County
Elevation:	614 ft (187 m)
Total Area:	6.58 sq mi (17.03 km²)
Land Area:	6.21 sq mi (16.08 km²)
Water Area:	0.37 sq mi (0.95 km²)
Total Population:	2,353
Population Density:	378.97/sq mi (146.31/km²)
Area code:	815
FIPS code:	1768640
GNISfeature ID:	2399784
Website:	senecail.org

Online Interactive Map

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Seneca online map. Source: Basemap layers from Google Map, Open Street Map (OSM), Arcgisonline, Wmflabs. Boundary Data from Database of Global Administrative Areas.

Seneca location map. Where is Seneca village?

Seneca location on the U.S. Map. Where is Seneca village. — Seneca location on the U.S. Map.

Seneca location on the Illinois map. Where is Seneca village. — Location of Seneca in Illinois.

History

The village of Seneca, formerly named Crotty after its founder, Jeremiah Crotty, was incorporated in 1865. The town was created during the construction of the Illinois and Michigan Canal for which Crotty was a contractor.

The Rock Island Railroad and the Illinois River also supported the creation and business of our town. Seneca is most known for its contributions during World War II when Chicago Bridge and Iron operated the Prairie Shipyard. 157 Landing Ship, Tanks (LST) were built here.

Seneca Road Map

Seneca city Satellite Map

Geography

Seneca is located at 41°18′40″N 88°36′35″W / 41.31111°N 88.60972°W / 41.31111; -88.60972 (41.3111442, -88.6097936).

According to the 2021 census gazetteer files, Seneca has a total area of 6.58 square miles (17.04 km), of which 6.21 square miles (16.08 km) (or 94.42%) is land and 0.37 square miles (0.96 km) (or 5.58%) is water.

Most of the village lies in LaSalle County, although a small portion extends into west central Grundy County. In the 2000 census, all of Seneca’s 2,082 residents lived in LaSalle County. According to 2006 population estimates, 2,082 of the village’s 2,087 residents (99.8%) lived in LaSalle County and 5 (0.2%) lived in Grundy County.

Seneca is located on the Illinois River, which connects Lake Michigan to the Mississippi River.