Reapportioning
Until 1965, the New Jersey State Senate was composed of 21 senators with each county electing one senator. After the U.S. Supreme Court decision in Reynolds v. Sims required legislative districts to be approximately equal in population (a principle known as "one man, one vote"), New Jersey entered a decade-long period of reapportioning. [1] In 1965, the Senate was increased to 29 members, with larger counties given multiple seats and some smaller counties sharing one or two senators.
For the 1967 election, the map was entirely redone. The 1967 Districts were organized by the 1966 New Jersey Constitutional Convention. The specific Assembly districts (used for the election Senator in multi-County multi-Senator Districts) were drawn by the New Jersey Apportionment Commission. Eleven new seats were added and county lines were generally followed (11 single county districts and 2 multi-county single senator districts). As a result of a New Jersey Supreme Court decision, several existing districts were split up into districts smaller than a single county. This was contrary to apportionment scheme in the New Jersey Constitution, following the 1966 New Jersey Constitutional Convention and popular ratification.
- Mercer, Middlesex, Union, Hudson, Bergen, and Passaic counties gained one seat each.
- Essex County gained two seats.
- Atlantic, Cape May, Camden, Cumberland, Gloucester, and Salem counties gained one combined seat for a total of six.
- Burlington, Monmouth, and Ocean counties gained one combined seat for a total of four.
- Hunterdon, Morris, Somerset, Sussex, and Warren counties gained one combined seat for a total of five.
| 1965 District | Counties | # | | 1967 District | Counties | # | ± |
|---|
| 1 | Atlantic, Cape May, and Gloucester | 2 | 1 | Cape May and Cumberland | 1 |  1 |
| 2 | Cumberland and Salem | 1 | 2 | Atlantic | 1 |
| 3 | Camden | 2 | 3A | Salem and Gloucester (part) | 1 |
| | | 3B | Gloucester (part) and Camden (part) | 1 |
| | | 3C | Camden (part) | 1 |
| | | 3D | Camden (part) | 1 |
| |
|---|
| 4 | Burlington | 1 | 4A | Burlington (part) and Ocean | 1 | 1 |
| 5 | Monmouth and Ocean | 2 | 4B | Burlington (part) | 1 |
| | | 5 | Monmouth | 2 |
| |
|---|
| 6 | Mercer | 1 | 6 | Mercer | 2 | 1 |
| 7 | Middlesex | 2 | 7 | Middlesex | 3 | 1 |
| 9 | Union | 2 | 9 | Union | 3 | 1 |
| 11 | Essex | 4 | 11 | Essex | 6 | 2 |
| 12 | Hudson | 3 | 12 | Hudson | 4 | 1 |
| 13 | Bergen | 4 | 13 | Bergen | 5 | 1 |
| 14 | Passaic | 2 | 14 | Passaic | 3 | 1 |
| | |
|---|
| 8 | Hunterdon and Somerset | 1 | 8 | Somerset | 1 | 1 |
| 10 | Morris, Sussex, Warren | 2 | 10 | Morris | 2 |
| | | 15 | Hunterdon, Warren, and Sussex | 1 |
