New Jersey License Plate County Codes: 1939-1958
| SERIAL LETTERS | COUNTY |
| AA-AL | Atlantic |
| BA-BZ, RA-RZ | Bergen |
| AM-AZ | Burlington |
| CA-CZ | Camden |
| ZW-ZZ | Cape May |
| ZL-ZV | Cumberland |
| EA-EZ, FA-FZ, JA-JZ, YA-YZ | Essex |
| ZA-ZK | Gloucester |
| HA-HZ, IA-IZ | Hudson |
| WT-WZ | Hunterdon |
| LA-LS | Mercer |
| KA-KZ | Middlesex |
| MA-MZ | Monmouth |
| VA-VZ | Morris |
| LT-LZ | Ocean |
| PA-PZ | Passaic |
| SA-SH | Salem |
| SI-SU | Somerset |
| SV-SZ | Sussex |
| NA-NZ, UA-UZ | Union |
| WA-WS | Warren |
