Sullivan County Post Office

Find Sullivan County New Hampshire post offices and USPS mailing boxes. Post offices provide information on bulk mail services, domestic mail delivery, international shipping, change of address, mail forwarding, PO boxes, and passport services.


Acworth Post Office 123 Hill Road Acworth NH 03601 603-835-2146


Claremont Post Office 140 Broad Street Claremont NH 03743 603-543-3051

Cornish Flat Post Office 241 Route 120 Claremont NH 03743 603-543-3502

Georges Mills Post Office 1294 Route 11 Sunapee NH 03751 603-763-4094

Goshen Post Office 25 Mill Village Road North Goshen NH 03752 603-863-4141

Grantham Post Office 10 Willis Avenue Grantham NH 03753 603-863-2280

Guild Post Office 16 Hale Street Newport NH 03754 603-863-5527

Lempster Post Office 767 New Hampshire 10 Lempster NH 03605 603-863-6429

Meriden Post Office 54 Main Street Plainfield NH 03770 603-469-3265

Newport Post Office 15 Park Street Newport NH 03773 603-863-3600

Plainfield Post Office 1132 New Hampshire 12A Plainfield NH 03781 603-675-2723

Springfield Post Office 2776 Main Street Springfield NH 03284 603-763-5001

Sunapee Post Office 5 Sunapee Street Sunapee NH 03782 603-763-5786

Washington Post Office 173 South Main Street Washington NH 03280 603-495-3467

What Change of Address options are available?

Customers can request a temporary or permanent Change of Address either online or in person at the Post Office using PS Form 3575. The online application for Change of Address has a $1.00 identity validation fee.

Is it possible to insure mail and items sent via the USPS?

Yes. Standard mail can be insured for up to $5,000 for an additional fee. Registered mail items can be insured for up to $50,000.

What is the USPS Office of Inspector General?

The Office of Inspector General (OIG) is a division within the USPS responsible for ensuring the integrity and accountability of the postal service. It conducts investigations to safeguard the postal system and performs audits and reviews.