What ZIP codes does Connecticut use for mail and package delivery?

Connecticut (CT) operates within the 5-digit ZIP prefix range 060xx–069xx. Mail routed to state capital Hartford and key regional centers such as Bridgeport, New Haven, Stamford adheres to these official USPS boundaries.

Which telephone area codes are valid for Connecticut?

Connecticut is served by 4 active North American Numbering Plan (NANPA) area codes: 203, 475, 860, 959. Synthetic telephone numbers for Connecticut use those area codes with a 555 exchange, which is reserved for fictitious use.

How many counties are in Connecticut?

Connecticut is divided into 8 counties, including major administrative regions such as Fairfield, Hartford, New Haven, New London. Generated street addresses use those names.

What postal formatting conventions and addressing quirks are unique to Connecticut?

Leading zero in all ZIP codes (06xxx), exposing spreadsheet and CSV numeric truncation bugs where 06101 is corrupted into 6101. Transition from 8 historical county borders to 9 regional Planning Councils for census and jurisdictional reporting. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.

Are the Connecticut addresses generated on this page real places?

No. All street numbers, recipient names, and telephone numbers generated for Connecticut are entirely synthetic and randomized for software testing, database seed scripts, and form validation. They use Connecticut ZIP codes from public USPS data and real city names, but they do not correspond to real individuals or private residences.

Random Connecticut Address Generator

These addresses are randomly generated for software testing. They are not real people’s details: the street number, unit and recipient name are invented, and no record is checked for deliverability.

Randomly generated Connecticut mailing addresses for software testing, form validation and staging data. Each record pairs a real Connecticut city with a ZIP prefix that serves it and the county that city sits in, then adds a street number, a secondary unit designator and a recipient name that are invented.

Official Connecticut Postal & Geographic Reference Specifications

Geographic & Postal Parameter	Official State Specification	Standardization Reference
Postal State Abbreviation	CT	USPS Publication 28 & ISO 3166-2:US
5-Digit ZIP Prefix Range	060xx–069xx	USPS prefix-to-state assignment
Administrative Jurisdictions	8 Total Counties	US Census Bureau regional boundaries
Active Area Codes (NANPA)	`203, 475, 860, 959` (4 total)	North American Numbering Plan Administrator
State Capital	Hartford	US Census Bureau
Primary Time Zone	Eastern Time (America/New_York, UTC-5 / UTC-4 DST)	IANA time zone database

Connecticut Postal Geography & Key Cities

ZIP codes and Sectional Center Facilities are derived from public USPS ZIP code data, area codes from the North American Numbering Plan, and county names from US Census Bureau records. Street numbers and recipient names are synthetic, and nothing is checked against an address-verification service.

Cities the generator draws from:

Bridgeport
New Haven
Stamford
Hartford
Waterbury
Greenwich

Key Counties & Administrative Jurisdictions

County boundaries determine local sales tax jurisdictions in Connecticut:

Fairfield County
Hartford County
New Haven County
New London County

Connecticut Area Codes (CT)

Generated phone numbers use the area codes listed in the reference table above, paired with a 555 exchange so no number can reach a real line. Generate Connecticut phone numbers.

Postal Delivery Standards & Format Nuances in Connecticut

Leading zero in all ZIP codes (06xxx), exposing spreadsheet and CSV numeric truncation bugs where 06101 is corrupted into 6101.
Transition from 8 historical county borders to 9 regional Planning Councils for census and jurisdictional reporting.

Connecticut Address Examples in USPS Publication 28 Format

Residential Delivery Point:
100 Main St, Apt 4B Bridgeport, CT 06604-1204

Commercial / Multi-Unit Delivery Point:
Connecticut Logistics & Software Corp 500 Enterprise Way, Suite 300 New Haven, CT 06510-4810

Frequently Asked Questions about Connecticut Addresses

What ZIP codes does Connecticut use for mail and package delivery?: Connecticut (CT) operates within the 5-digit ZIP prefix range 060xx–069xx. Mail routed to state capital Hartford and key regional centers such as Bridgeport, New Haven, Stamford adheres to these official USPS boundaries.
Which telephone area codes are valid for Connecticut?: Connecticut is served by 4 active North American Numbering Plan (NANPA) area codes: 203, 475, 860, 959. Synthetic telephone numbers for Connecticut use those area codes with a 555 exchange, which is reserved for fictitious use.
How many counties are in Connecticut?: Connecticut is divided into 8 counties, including major administrative regions such as Fairfield, Hartford, New Haven, New London. Generated street addresses use those names.
What postal formatting conventions and addressing quirks are unique to Connecticut?: Leading zero in all ZIP codes (06xxx), exposing spreadsheet and CSV numeric truncation bugs where 06101 is corrupted into 6101. Transition from 8 historical county borders to 9 regional Planning Councils for census and jurisdictional reporting. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.
Are the Connecticut addresses generated on this page real places?: No. All street numbers, recipient names, and telephone numbers generated for Connecticut are entirely synthetic and randomized for software testing, database seed scripts, and form validation. They use Connecticut ZIP codes from public USPS data and real city names, but they do not correspond to real individuals or private residences.

Nearby & Bordering States

Explore test address generators for states sharing a geographic border with CT:

Connecticut ZIP Prefixes

The first three digits of a ZIP code place an address within Connecticut. These are the prefixes assigned to the state:

060xx, 061xx, 064xx, 065xx, 066xx, 067xx, 068xx, 069xx

Which processing facility sorts a given prefix is set by the current USPS labeling list L005 and changes as processing is consolidated, so it is not reproduced here. Look up a ZIP prefix to see its state and generate ZIP codes inside it.