Post Offices List in South Amboy City, New Jersey:
| South Amboy Post Office | 209 S Broadway, South Amboy, NJ 08879 |
| Laurence Harbor Post Office | 902 State Route 35, South Amboy, NJ 08879 |
| South Amboy Post Office | 209 S Broadway, South Amboy, NJ 08879 |
| Laurence Harbor Post Office | 902 State Route 35, South Amboy, NJ 08879 |