Plainfield, New Jersey was incorporated on April 21, 1869. Mayors are sworn in on January 1 of the new year, so there are no overlaps in years unless someone has died in office or resigned.
References
- "Mayors of Plainfield". Plainfield, New Jersey. Retrieved 2011-11-02.
- "Job Male, Plainfield's Grand Old Man". Plainfield, New Jersey. Retrieved 2011-11-03.