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You can find ZIP codes by city or state using our search tool. Just enter the city or state name, and you'll see all related ZIP codes instantly.

What is a ZIP+4 code?

A ZIP+4 code adds four digits to the basic five-digit ZIP code. It helps the USPS deliver mail more precisely to specific addresses or buildings.

Are ZIP codes the same as postal codes?

ZIP codes are the U.S. version of postal codes, used by the USPS to identify delivery areas. Other countries use postal codes with different formats.

Complete ZIP Codes For Middlesex, Connecticut

Browse Middlesex ZIP Codes

ZIP Codes in Middlesex County help organize mail delivery and define local service areas. Each ZIP Code corresponds to a specific community or post office, ensuring residents, businesses, and visitors can find accurate address information quickly. By browsing the complete list of Middlesex ZIP Codes, you can easily identify the correct code for mailing, business, or geographic purposes.

Middletown

Post Office	Middletown
Division	Middlesex
Pincode	6457

Cromwell

Post Office	Cromwell
Division	Middlesex
Pincode	6416

Clinton

Post Office	Clinton
Division	Middlesex
Pincode	6413

East Hampton

Post Office	East Hampton
Division	Middlesex
Pincode	6424

Old Saybrook

Post Office	Old Saybrook
Division	Middlesex
Pincode	6475

Portland

Post Office	Portland
Division	Middlesex
Pincode	6480

Total Post Offices (23) Page 1 of 4
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Cities in Middlesex

22 cities in Middlesex County | List of ZIP Codes in Connecticut

ZIP codes in Middlesex County, Connecticut not only facilitate mail delivery but also provide important demographic and geographic insights. Each ZIP code corresponds to specific areas within the county, helping businesses, residents, and researchers understand population distribution, city locations, and service coverage across Middlesex County.

Businesses and service providers rely on accurate ZIP code information in Middlesex County to plan deliveries, target customers, and ensure timely services. By referencing the full list of ZIP codes, companies can optimize logistics and outreach, while residents can easily identify the correct postal codes for their addresses within Connecticut.

Knowing the correct ZIP codes in Middlesex County ensures fast and accurate mail delivery from the United States Postal Service (USPS). It also helps travelers, online shoppers, and local residents navigate efficiently across towns and communities in Middlesex County, making ZIP codes an essential part of daily life and business operations.