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

Kentucky (KY) operates within the 5-digit ZIP prefix range 400xx–427xx, covering numeric postal codes from 40003 – 42788. Mail routed to state capital Frankfort and key regional centers such as Louisville, Lexington, Bowling Green adheres to these official USPS boundaries.

Which telephone area codes are valid for Kentucky?

Kentucky is served by 5 active North American Numbering Plan (NANPA) area codes: 270, 364, 502, 606, 859. Synthetic telephone numbers generated for Kentucky reflect these verified regional area code assignments across state jurisdictions.

How many counties are in Kentucky?

Kentucky is divided into 120 counties, including major administrative regions such as Jefferson, Fayette, Kenton, Boone. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.

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

Independent 'Home Rule' municipal enclaves within Jefferson County (Louisville Metro) where cities like St. Matthews or Jeffersontown possess separate taxing authorities inside Louisville postal codes. Third highest county count in the nation (120 historical counties) creating dense jurisdictional fragmentation across 400xx–427xx. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.

Are the Kentucky addresses generated on this page real places?

No. All street numbers, recipient names, and telephone numbers generated for Kentucky are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Kentucky ZIP codes (400xx–427xx), real city names (Louisville, Lexington), and verified area codes (270, 364), they do not correspond to real individuals or private residences.

Random Kentucky Address Generator

Kentucky ZIP codes span the 400xx–427xx range (40003 – 42788) across 120 counties with 5 active telephone area codes (270, 364, 502, 606, etc.).

Generate a realistic, USPS Publication 28-compliant random Kentucky address with authentic postal routing, real ZIP codes, and local area codes. Featuring verified ZIP prefix coverage across 400xx–427xx, realistic street grids from Louisville and Lexington, official area codes (270, 364, 502, 606), and accurate county assignments. Engineered specifically for QA automation, form validation, and software testing.

Official Kentucky Postal & Geographic Reference Specifications

Geographic & Postal Parameter	Official State Specification	Standardization Reference
Postal State Abbreviation	KY	USPS Publication 28 & ISO 3166-2:US
5-Digit ZIP Prefix Range	400xx–427xx	USPS Sectional Center Facilities (SCFs)
5-Digit ZIP Numeric Span	`40003 – 42788`	Lowest to highest active postal delivery codes
Administrative Jurisdictions	120 Total Counties	US Census Bureau regional boundaries
Active Area Codes (NANPA)	`270, 364, 502, 606, 859` (5 total)	North American Numbering Plan Administrator
Capital & Distribution Centers	Frankfort (Capital), Louisville, Lexington, Bowling Green	Primary municipal carrier distribution hubs
Primary Time Zone	Eastern Time (America/New_York, UTC-5 / UTC-4 DST)	Regional postal dispatch & timestamp alignment
Authoritative Validation Source	Kentucky Public Service Commission & NANPA	Official state regulatory authority

Kentucky Postal Geography & Key Cities

State Capital: Frankfort | Postal Code: KY | Total Counties: 120 Counties | ZIP Prefix Range: 400xx–427xx

Verified Data Authority: Kentucky Public Service Commission & NANPA

Major municipal distribution centers:

Louisville
Lexington
Bowling Green
Owensboro
Covington

Key Counties & Administrative Jurisdictions

County boundaries dictate local sales tax jurisdictions and carrier route groupings across Kentucky:

Jefferson County
Fayette County
Kenton County
Boone County
Warren County

Real Kentucky Area Codes (KY)

5 active numbering plan area (NPA) codes serving 120 jurisdictions across Kentucky.

Active North American Numbering Plan area codes: 270, 364, 502, 606, 859

Postal Delivery Standards & Format Nuances in Kentucky

Independent 'Home Rule' municipal enclaves within Jefferson County (Louisville Metro) where cities like St. Matthews or Jeffersontown possess separate taxing authorities inside Louisville postal codes.
Third highest county count in the nation (120 historical counties) creating dense jurisdictional fragmentation across 400xx–427xx.

Standard USPS Publication 28 Test Examples for Kentucky

Residential Delivery Point:
100 Main St, Apt 4B Louisville, KY 40202-1204

Commercial / Multi-Unit Delivery Point:
Kentucky Logistics & Software Corp 500 Enterprise Way, Suite 300 Lexington, KY 40502-4810

Frequently Asked Questions about Kentucky Addresses

What ZIP codes does Kentucky use for mail and package delivery?: Kentucky (KY) operates within the 5-digit ZIP prefix range 400xx–427xx, covering numeric postal codes from 40003 – 42788. Mail routed to state capital Frankfort and key regional centers such as Louisville, Lexington, Bowling Green adheres to these official USPS boundaries.
Which telephone area codes are valid for Kentucky?: Kentucky is served by 5 active North American Numbering Plan (NANPA) area codes: 270, 364, 502, 606, 859. Synthetic telephone numbers generated for Kentucky reflect these verified regional area code assignments across state jurisdictions.
How many counties are in Kentucky?: Kentucky is divided into 120 counties, including major administrative regions such as Jefferson, Fayette, Kenton, Boone. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.
What postal formatting conventions and addressing quirks are unique to Kentucky?: Independent 'Home Rule' municipal enclaves within Jefferson County (Louisville Metro) where cities like St. Matthews or Jeffersontown possess separate taxing authorities inside Louisville postal codes. Third highest county count in the nation (120 historical counties) creating dense jurisdictional fragmentation across 400xx–427xx. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.
Are the Kentucky addresses generated on this page real places?: No. All street numbers, recipient names, and telephone numbers generated for Kentucky are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Kentucky ZIP codes (400xx–427xx), real city names (Louisville, Lexington), and verified area codes (270, 364), they do not correspond to real individuals or private residences.

Nearby & Bordering States

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

Kentucky ZIP Prefixes and Sectional Center Facilities

Mail addressed to Kentucky is sorted through the processing facilities below before local delivery. The first three digits of a ZIP code identify which one, so the prefix alone places an address within the state.

ZIP prefix	Sectional Center Facility	County
402xx	Louisville	Jefferson County
405xx	Lexington	Fayette County

These 2 prefixes cover the 400xx–427xx range. Look up any ZIP prefix to see its facility and generate valid ZIP codes inside it.