Post Offices List in Sayville City, New York:
| Sayville Post Office | 130 Greene Ave, Sayville, NY 11782 |
| Cherry Grove Post Office | 1000 Bay Walk, Sayville, NY 11782 |
| Fire Island Pines Post Office | 1 Fire Island Blvd, Sayville, NY 11782 |
| Sayville Post Office | 130 Greene Ave, Sayville, NY 11782 |
| Cherry Grove Post Office | 1000 Bay Walk, Sayville, NY 11782 |
| Fire Island Pines Post Office | 1 Fire Island Blvd, Sayville, NY 11782 |