The city of Fleming Island is assigned specific ZIP Code(s) by the United States Postal Service (USPS) to make mail delivery accurate and efficient. A ZIP Code in Fleming Island helps identify the correct postal area, ensuring that letters, parcels, and packages reach the right neighborhood or post office without delay. For residents, businesses, and visitors, knowing the correct Fleming Island ZIP Code is important not only for mailing purposes but also for location-based services, navigation, and demographic reference.
| Post Office | Fleming Island |
| County | Clay |
| State | Florida |
| ZIP Code | 32003 |
| Post Office | Fleming Island |
| County | Clay |
| State | Florida |
| ZIP Code | 32006 |