06421

06421 is a United States ZIP code assigned by the United States Postal Service to designate a specific geographic delivery area in the state of Connecticut, in the New England region. ZIP codes are used to route mail efficiently and to identify geographic areas for data collection and service delivery. The 06421 code belongs to the Connecticut numbering plan area and lies within the broader regional system used for mail processing; the exact boundaries are maintained by USPS and can change over time. In practice, 06421 may cover all or part of one or more towns and is served by the local post offices that handle mail for that area.

The ZIP code system was introduced in 1963 to improve mail sorting and delivery. Since then, codes can be updated or reorganized in response to changes in population, postal volumes, or facility locations. While 06421 identifies a delivery region, it does not by itself determine municipal borders; ZIP codes often cross municipal lines and may be shared by neighboring communities.

Beyond mail routing, ZIP codes like 06421 are used in a variety of applications, including demographic studies, marketing analytics, logistics planning, and geographic information systems. They provide a convenient shorthand for locating populations and services within a defined area of Connecticut.

See also: ZIP code, Connecticut, United States Postal Service, ZIP Code Lookup.