The Town of Islip is located in Suffolk County, New York.
| Date | Holiday |
|---|---|
| 01/01/2021 | New Year's Day |
| 01/18/2021 | Martin Luther King, Jr. Day |
| 02/15/2021 | George Washington's Birthday |
| 05/31/2021 | Memorial Day |
| 07/05/2021 | Independence Day |
| 09/06/2021 | Labor Day |
| 10/11/2021 | Columbus Day |
| 11/11/2021 | Veterans Day |
| 11/25/2021 | Thanksgiving Day |
| 12/24/2021 | Christmas Day |
| 12/31/2021 | New Year's Day |
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