The city of New Underwood is assigned specific ZIP Code(s) by the United States Postal Service (USPS) to make mail delivery accurate and efficient. A ZIP Code in New Underwood 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 New Underwood ZIP Code is important not only for mailing purposes but also for location-based services, navigation, and demographic reference.
| Post Office | New Underwood |
| County | Pennington |
| State | South Dakota |
| ZIP Code | 57761 |