Following the legislative redistricting process which occurs every 10 years after each census, New Jersey Legislative District 25 gained new municipalities and lost others. The newest district lines will be going into effect in the 2023 election year and sworn into office in January 2024.
District 25 Municipalities – Bolded names (and yellow towns on the map) include new communities for the 2023 election:
Boonton Township Butler Dover Harding Kinnelon Jefferson Township Madison Mendham Borough Mendham Township Mine Hill Morris Township Morristown Mount Arlington Randolph Rockaway Borough Rockaway Township West Milford Wharton Victory Gardens |  |