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

Colorado (CO) operates within the 5-digit ZIP prefix range 800xx–816xx, covering numeric postal codes from 80001 – 81658. Mail routed to state capital Denver and key regional centers such as Denver, Colorado Springs, Aurora adheres to these official USPS boundaries.

Which telephone area codes are valid for Colorado?

Colorado is served by 5 active North American Numbering Plan (NANPA) area codes: 303, 719, 720, 970, 983. Synthetic telephone numbers generated for Colorado reflect these verified regional area code assignments across state jurisdictions.

How many counties are in Colorado?

Colorado is divided into 64 counties, including major administrative regions such as Denver, El Paso, Arapahoe, Jefferson. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.

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

High-altitude mountain community P.O. Box mandates (such as Aspen, Vail, Breckenridge) where USPS does not provide residential carrier delivery due to terrain and winter accessibility. Denver's strict alphanumeric named-street alphabetic grid (e.g., Albion, Bellaire, Clermont) running orthogonal to numbered avenues. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.

Are the Colorado addresses generated on this page real places?

No. All street numbers, recipient names, and telephone numbers generated for Colorado are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Colorado ZIP codes (800xx–816xx), real city names (Denver, Colorado Springs), and verified area codes (303, 719), they do not correspond to real individuals or private residences.

Random Colorado Address Generator

Colorado ZIP codes span the 800xx–816xx range (80001 – 81658) across 64 counties with 5 active telephone area codes (303, 719, 720, 970, etc.).

Generate a realistic, USPS Publication 28-compliant random Colorado address with authentic postal routing, real ZIP codes, and local area codes. Featuring verified ZIP prefix coverage across 800xx–816xx, realistic street grids from Denver and Colorado Springs, official area codes (303, 719, 720, 970), and accurate county assignments. Engineered specifically for QA automation, form validation, and software testing.

Official Colorado Postal & Geographic Reference Specifications

Geographic & Postal Parameter	Official State Specification	Standardization Reference
Postal State Abbreviation	CO	USPS Publication 28 & ISO 3166-2:US
5-Digit ZIP Prefix Range	800xx–816xx	USPS Sectional Center Facilities (SCFs)
5-Digit ZIP Numeric Span	`80001 – 81658`	Lowest to highest active postal delivery codes
Administrative Jurisdictions	64 Total Counties	US Census Bureau regional boundaries
Active Area Codes (NANPA)	`303, 719, 720, 970, 983` (5 total)	North American Numbering Plan Administrator
Capital & Distribution Centers	Denver (Capital), Denver, Colorado Springs, Aurora	Primary municipal carrier distribution hubs
Primary Time Zone	Mountain Time (America/Denver, UTC-7 / UTC-6 DST)	Regional postal dispatch & timestamp alignment
Authoritative Validation Source	Colorado Public Utilities Commission & NANPA	Official state regulatory authority

Colorado Postal Geography & Key Cities

State Capital: Denver | Postal Code: CO | Total Counties: 64 Counties | ZIP Prefix Range: 800xx–816xx

Verified Data Authority: Colorado Public Utilities Commission & NANPA

Major municipal distribution centers:

Denver
Colorado Springs
Aurora
Fort Collins
Boulder
Lakewood

Key Counties & Administrative Jurisdictions

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

Denver County
El Paso County
Arapahoe County
Jefferson County
Boulder County

Real Colorado Area Codes (CO)

5 active numbering plan area (NPA) codes serving 64 jurisdictions across Colorado.

Active North American Numbering Plan area codes: 303, 719, 720, 970, 983

Postal Delivery Standards & Format Nuances in Colorado

High-altitude mountain community P.O. Box mandates (such as Aspen, Vail, Breckenridge) where USPS does not provide residential carrier delivery due to terrain and winter accessibility.
Denver's strict alphanumeric named-street alphabetic grid (e.g., Albion, Bellaire, Clermont) running orthogonal to numbered avenues.

Standard USPS Publication 28 Test Examples for Colorado

Residential Delivery Point:
100 Main St, Apt 4B Denver, CO 80202-1204

Commercial / Multi-Unit Delivery Point:
Colorado Logistics & Software Corp 500 Enterprise Way, Suite 300 Colorado Springs, CO 80903-4810

Frequently Asked Questions about Colorado Addresses

What ZIP codes does Colorado use for mail and package delivery?: Colorado (CO) operates within the 5-digit ZIP prefix range 800xx–816xx, covering numeric postal codes from 80001 – 81658. Mail routed to state capital Denver and key regional centers such as Denver, Colorado Springs, Aurora adheres to these official USPS boundaries.
Which telephone area codes are valid for Colorado?: Colorado is served by 5 active North American Numbering Plan (NANPA) area codes: 303, 719, 720, 970, 983. Synthetic telephone numbers generated for Colorado reflect these verified regional area code assignments across state jurisdictions.
How many counties are in Colorado?: Colorado is divided into 64 counties, including major administrative regions such as Denver, El Paso, Arapahoe, Jefferson. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.
What postal formatting conventions and addressing quirks are unique to Colorado?: High-altitude mountain community P.O. Box mandates (such as Aspen, Vail, Breckenridge) where USPS does not provide residential carrier delivery due to terrain and winter accessibility. Denver's strict alphanumeric named-street alphabetic grid (e.g., Albion, Bellaire, Clermont) running orthogonal to numbered avenues. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.
Are the Colorado addresses generated on this page real places?: No. All street numbers, recipient names, and telephone numbers generated for Colorado are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Colorado ZIP codes (800xx–816xx), real city names (Denver, Colorado Springs), and verified area codes (303, 719), they do not correspond to real individuals or private residences.

Nearby & Bordering States

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

Colorado ZIP Prefixes and Sectional Center Facilities

Mail addressed to Colorado 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
800xx	Aurora / Arapahoe	Arapahoe County
802xx	Denver	Denver County
803xx	Boulder	Boulder County
805xx	Fort Collins	Larimer County
809xx	Colorado Springs	El Paso County
816xx	Glenwood Springs / Aspen / Vail	Garfield County

These 6 prefixes cover the 800xx–816xx range. Look up any ZIP prefix to see its facility and generate valid ZIP codes inside it.