Middlesex County, Connecticut ZIP Codes

Provided by Ernest Adams, Mobile Notary Public

This information is provided as a public service. Please see the Disclaimers before relying on these data.

Middlesex County ZIP Codes
LocationZIP CodeActual Name (per USPS)
LocationZIP CodeActual Name (per USPS)
Bashan, CT06424(East Hampton)
Centerbrook, CT06409
Chester, CT [C1]06412
Clinton, CT06413
Cobalt, CT06414
Cromwell, CT06416
Deep River, CT06417, 06419WWW.DeepRiverCT.Com (external Site)
Durham, CT06422
East Haddam, CT06423WWW.EastHaddam.Org (external Site)
East Hampton, CT [E1]06424
Essex, CT06426
Fenwick, CT06475(Old Saybrook)
Gildersleeve, CT06480(Portland, CT)
Gillette Castle State Park06423(East Haddam)
Haddam, CT06438
Haddam Neck, CT06424(East Hampton)
Higganum, CT [H1]06441
Ivoryton, CT06442
Killingworth, CT [K1]06419
Lake Pocotopaug, CT06424(East Hampton)
Middlefield, CT06455
Middletown, CT06457
Millington, CT06423(East Haddam)
Moodus, CT06469
Old Saybrook, CT06475
Portland, CT06480
Rockfall, CT06481(Rock Fall, CT, Rockwall, CT, and Rockall, CT are all misspellings)
Saybrook Point, CT06475(Old Saybrook)
Westbrook, CT06498
Westfield06457(Middletown, CT)
Winthrop,06417(Deep River)


Middlesex County Connecticut is the only Connecticut County that is not named for a city or town within that county. Essex is a town within Middlesex County. That is why Middlesex County is sometimes mistakenly called "Essex County Connecticut".

[C1] Chester, CT in Middlesex County should not be confused with Cheshire, CT (a town in New Haven County).
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[E1] East Hampton, CT in Middlesex County should not be confused with Hampton, CT (a town in Windham County).
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[H1] Higganum, CT in Middlesex County should not be confused with Hockanum, CT (a town in Hartford County).
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[K1] Killingworth, CT in Middlesex County should not be confused with Killingly, CT (a town in Windham County).
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All of the ZIP Code information on this Page comes from the United States Postal Service (USPS), also known as the Post Office. I cannot guarantee its accuracy. Please visit the USPS Web Site at WWW.USPS.Com for further information.

I am not an attorney. ¡Yo no soy Notario Publico! I cannot give legal advice.

If you need legal help, please consult an attorney authorized to practice law in Connecticut (or the state in which you live). All opinions expressed on this Site are that of a layman, except where cited sources are clearly noted.

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I can notarize the signature on a document only if the signer and I can communicate in English, either verbally or in writing. We cannot use a translator.

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Version 6.00   8 April 2016