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

Delaware (DE) operates within the 5-digit ZIP prefix range 197xx–199xx, covering numeric postal codes from 19701 – 19980. Mail routed to state capital Dover and key regional centers such as Wilmington, Dover, Newark adheres to these official USPS boundaries.

Which telephone area codes are valid for Delaware?

Delaware is served by a single statewide area code: 302. Because Delaware operates under a single numbering plan area (NPA), every valid Delaware phone number begins with 302 — there are no regional sub-assignments to account for in test data. Synthetic telephone numbers generated for Delaware strictly use area code 302 with verified local exchanges to match authentic state dial plans.

How many counties are in Delaware?

Delaware is divided into 3 counties, including major administrative regions such as New Castle, Kent, Sussex. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.

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

Single statewide 302 area code with unique colonial 'Hundred' sub-county civil divisions (e.g., Brandywine Hundred, White Clay Creek Hundred) that still appear on property deeds and legal address records. Three-county linear postal corridor (New Castle, Kent, Sussex) spanning 197xx–199xx ZIP codes. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.

Are the Delaware addresses generated on this page real places?

No. All street numbers, recipient names, and telephone numbers generated for Delaware are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Delaware ZIP codes (197xx–199xx), real city names (Wilmington, Dover), and verified area codes (302), they do not correspond to real individuals or private residences.

Random Delaware Address Generator

Delaware ZIP codes span the 197xx–199xx range (19701 – 19980) across 3 counties with 1 active telephone area code (302).

Generate a realistic, USPS Publication 28-compliant random Delaware address with authentic postal routing, real ZIP codes, and local area codes. Featuring verified ZIP prefix coverage across 197xx–199xx, realistic street grids from Wilmington and Dover, official area codes (302), and accurate county assignments. Engineered specifically for QA automation, form validation, and software testing.

Official Delaware Postal & Geographic Reference Specifications

Geographic & Postal Parameter	Official State Specification	Standardization Reference
Postal State Abbreviation	DE	USPS Publication 28 & ISO 3166-2:US
5-Digit ZIP Prefix Range	197xx–199xx	USPS Sectional Center Facilities (SCFs)
5-Digit ZIP Numeric Span	`19701 – 19980`	Lowest to highest active postal delivery codes
Administrative Jurisdictions	3 Total Counties	US Census Bureau regional boundaries
Active Area Codes (NANPA)	`302` (1 total)	North American Numbering Plan Administrator
Capital & Distribution Centers	Dover (Capital), Wilmington, Dover, Newark	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	Delaware Public Service Commission & NANPA	Official state regulatory authority

Delaware Postal Geography & Key Cities

State Capital: Dover | Postal Code: DE | Total Counties: 3 Counties | ZIP Prefix Range: 197xx–199xx

Verified Data Authority: Delaware Public Service Commission & NANPA

Major municipal distribution centers:

Wilmington
Dover
Newark
Middletown
Smyrna

Key Counties & Administrative Jurisdictions

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

New Castle County
Kent County
Sussex County

Real Delaware Area Codes (DE)

1 active numbering plan area (NPA) serving 3 jurisdictions across Delaware.

Active North American Numbering Plan area codes: 302

Postal Delivery Standards & Format Nuances in Delaware

Single statewide 302 area code with unique colonial 'Hundred' sub-county civil divisions (e.g., Brandywine Hundred, White Clay Creek Hundred) that still appear on property deeds and legal address records.
Three-county linear postal corridor (New Castle, Kent, Sussex) spanning 197xx–199xx ZIP codes.

Standard USPS Publication 28 Test Examples for Delaware

Residential Delivery Point:
100 Main St, Apt 4B Wilmington, DE 19801-1204

Commercial / Multi-Unit Delivery Point:
Delaware Logistics & Software Corp 500 Enterprise Way, Suite 300 Dover, DE 19901-4810

Frequently Asked Questions about Delaware Addresses

What ZIP codes does Delaware use for mail and package delivery?: Delaware (DE) operates within the 5-digit ZIP prefix range 197xx–199xx, covering numeric postal codes from 19701 – 19980. Mail routed to state capital Dover and key regional centers such as Wilmington, Dover, Newark adheres to these official USPS boundaries.
Which telephone area codes are valid for Delaware?: Delaware is served by a single statewide area code: 302. Because Delaware operates under a single numbering plan area (NPA), every valid Delaware phone number begins with 302 — there are no regional sub-assignments to account for in test data. Synthetic telephone numbers generated for Delaware strictly use area code 302 with verified local exchanges to match authentic state dial plans.
How many counties are in Delaware?: Delaware is divided into 3 counties, including major administrative regions such as New Castle, Kent, Sussex. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.
What postal formatting conventions and addressing quirks are unique to Delaware?: Single statewide 302 area code with unique colonial 'Hundred' sub-county civil divisions (e.g., Brandywine Hundred, White Clay Creek Hundred) that still appear on property deeds and legal address records. Three-county linear postal corridor (New Castle, Kent, Sussex) spanning 197xx–199xx ZIP codes. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.
Are the Delaware addresses generated on this page real places?: No. All street numbers, recipient names, and telephone numbers generated for Delaware are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Delaware ZIP codes (197xx–199xx), real city names (Wilmington, Dover), and verified area codes (302), they do not correspond to real individuals or private residences.

Nearby & Bordering States

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

Delaware ZIP Prefixes and Sectional Center Facilities

Mail addressed to Delaware 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
197xx	Newark / New Castle	New Castle County
198xx	Wilmington	New Castle County
199xx	Dover	Kent County

These 3 prefixes cover the 197xx–199xx range. Look up any ZIP prefix to see its facility and generate valid ZIP codes inside it.