Middlesex County Post Office

Find Middlesex County Connecticut 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.


Centerbrook Post Office 4 Westbrook Road Essex Village CT 06409 860-767-8730


Chester Post Office 100 Main Street Chester CT 06412 860-526-2780

Clinton Post Office 2 West Main Street Clinton CT 06413 860-669-4155

Cobalt Post Office 371 West High Street East Hampton CT 06424 860-267-5605

Cromwell Post Office 528 Main Street Cromwell CT 06416 860-635-5611

Deep River Post Office 225 Main Street Deep River CT 06417 860-526-5970

Durham Post Office 1 Main Street Durham CT 06422 580-983-2281

Durham Post Office 103 Main Street Durham CT 06422 860-349-3350

East Haddam Post Office 34 Main Street East Haddam CT 06423 860-873-8521

East Hampton Post Office 57 Main Street East Hampton CT 06424 860-267-2094

Essex Post Office 12 Main Street Essex CT 06426 860-767-8476

Haddam Post Office 1050 Saybrook Road Haddam CT 06438 860-345-4770

Higganum Post Office 26 Killingworth Road Haddam CT 06441 860-345-2703

Ivoryton Post Office 98 Main Street Essex CT 06442 860-767-8515

Middle Haddam Post Office 77 Middle Haddam Road East Hampton CT 06456 860-267-5604

Middlefield Post Office 456 Main Street Middlefield CT 06455 860-349-7174

Middletown Post Office 11 Silver Street Middletown CT 06457 860-638-6977

Moodus Post Office 34 Falls Road East Haddam CT 06469 860-873-8632

Old Saybrook Post Office 36 Main Street Old Saybrook CT 06475 860-388-4479

Portland Post Office 320 Main Street Portland CT 06480 860-342-0081

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.