Jenison is a census-designated place (CDP) in Ottawa County in the U.S. state of Michigan.

The current estimated population for the entire Jenison ZIP code, 49428, is 26,156.

[4] The area that Jenison occupies was first inhabited by Peoria and Odawa indigenous peoples, and later populated by white settlers in 1836 as a lumber site along the Grand River.

[6] A post office called Jenisonville was established in 1872, and the name was changed to Jenison in 1887.

16.9% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older.