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.

A French missionary by the name of Father Gabriel de la Ribourde brought Catholicism to the Seneca area 175 years before St. Patrick’s Parish was founded.

In 1680, he was traveling with an exploratory party from Quebec when he was ambushed and killed by a band of Kickapoo Indians.

[3] Seneca was first settled by Jeremiah Crotty, an entrepreneur and contractor who helped build the Illinois and Michigan Canal.

The town was created during the construction of the Illinois and Michigan Canal for which Crotty was a contractor.

[4] 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.

Seneca is rich with history with the Illinois and Michigan Canal running through the center of the city's downtown area.

The association has already developed a business directory and coordinated a number of fundraisers for local non-profit agencies.

The 2005 Illinois State Board of Education's 2005 Illinois District Report Card shows that the Seneca High School was strongly funded - in large part through payments made by Commonwealth Edison's power generation plant located approximately ten miles south of Seneca.

[citation needed] ∗In 2018, Christopher Collet won the IHSA State Cross Country Championships.