Middlesex County Connecticut is covered by a total of 26 ZIP Codes. There are 3 ZIP Codes in Middlesex County that extend into adjacent counties (Hartford County, and New London County). Of the ZIP codes within or partially within Middlesex County there are 22 Standard ZIP Codes, 1 Unique ZIP Codes and 2 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Middlesex County and can be turned on and off. Each type of postal code can also be turned on and off.
| ZIP Code | ZIP Code City/Town | ZIP Code Type | |||
|---|---|---|---|---|---|
| South Glastonbury | Standard | |||
| Centerbrook | Standard | |||
| Chester | Standard | |||
| Clinton | Standard | |||
| Cobalt | PO Box | |||
| Colchester | Standard | |||
| Cromwell | Standard | |||
| Deep River | Standard | |||
| Killingworth | Standard | |||
| Salem | Standard | |||
| Durham | Standard | |||
| East Haddam | Standard | |||
| East Hampton | Standard | |||
| Essex | Standard | |||
| Haddam | Standard | |||
| Higganum | Standard | |||
| Ivoryton | Standard | |||
| Middlefield | Standard | |||
| Middle Haddam | PO Box | |||
| Middletown | Standard | |||
| Middletown | Unique | |||
| Moodus | Standard | |||
| Old Saybrook | Standard | |||
| Portland | Standard | |||
| Rockfall | Standard | |||
| Westbrook | Standard |