ZIP Code 11556 is located in Uniondale New York. Portions of 11556 are also in Hempstead (town). 11556 is entirely within Nassau County. Regionally, 11556 is located in Metro New York City.
| ZIP Code Name | Uniondale |
| Primary County | Nassau County |
| ZIP Code Type | Standard |
| Area Code(s) | 363 / 516 |
| Current Time | EST |
| Coordinates | 40.71965790,-73.58389282 |
| Adjacent ZIP Codes | |
| Cities/Towns in 11556 | |
| Region | Metro New York City |
| Metropolitan/Micropolitan Stat Area | New York-Newark-Jersey City, NY-NJ-PA |
| Time Zone | Eastern Standard Time |
| IANA Timezone | America/New_York |
| Area | 0.05289078 Square Miles |
| School Districts in 11556 |