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- Jacob and Martin Beiger, and Adolphus Eberhart — the woolen founding, in three hands Founders & CEOs
- The Jewish community: Mishawaka families in a county institution Communities
- The Jewish Congregations: None Seated Here, the Valley's Three Across the River Churches & Religion
- Jim Gaffigan: the claim, tested where it belongs Comedy
- Jim Strickland: a Mishawaka birth, a Memphis life Notable People
- The jitney test, run whole Public Transit
- The JLTV recompete: the successor's contract AM General
- The JLTV's hard second act, and the Humvee's new money AM General
- John Brademas: eleven terms, then a university Notable People
- John D. Stearns: one line, 1868 Photographers
- The Joint Operating Agreement Question Newspapers & Media
- Jordan H. Kapson: The Dealer Fortune, Priced by Its Gift Great Fortunes
- The Jordan house: from Ramblers to a group, on one Jefferson Boulevard corner Dealerships
- Joseph K. Sosnowski: the Mishawaka years, 1906–1910 Photographers
- Joy Lynn White: Little Lynn of the Singing White Family Notable People
- July 1947: the first saucer wave — the Mishawaka test UFO Sightings
- July 4, 2020: the Main Street bridge protest Black History