Post office locations in 03857
| Post Office | Address | Phone | Hours |
| NEWMARKET | 126 MAIN ST NEWMARKET, NH 03857 - 1643 | 603-659-8549 | Mon-Fri 8:30am - 5:00pm Sat 8:30am - 12:00pm Sun Closed |
| Post Office | Address | Phone | Hours |
| NEWMARKET | 126 MAIN ST NEWMARKET, NH 03857 - 1643 | 603-659-8549 | Mon-Fri 8:30am - 5:00pm Sat 8:30am - 12:00pm Sun Closed |