Post Offices List in Hauppauge City, New York:
| Hauppauge Post Office | 960 Wheeler Rd, Hauppauge, NY 11788 |
| Hauppauge Industrial Park Post Office | 150 Oser Ave, Hauppauge, NY 11788 |
| Hauppauge Post Office | 960 Wheeler Rd, Hauppauge, NY 11788 |
| Hauppauge Industrial Park Post Office | 150 Oser Ave, Hauppauge, NY 11788 |