ZIP Codes in Colorado
Colorado's ZIP codes cover a state split almost evenly between the flat, populous eastern plains and the towering peaks of the Rocky Mountains to the west. With around 5.8 million residents and one of the highest average elevations of any US state, Colorado's postal geography reflects a population heavily concentrated along the Front Range corridor, with mountain resort towns and rural plains counties covering most of the remaining land area.
How ZIP Codes Are Organized Across the State
Colorado's ZIP codes fall within the 80000–81699 range under the USPS system. Denver and the surrounding metro area anchor the lower end around 802xx, with Colorado Springs close behind near 809xx. Boulder, home to the University of Colorado's flagship campus, sits at 803xx, while the mountain resort towns and the Western Slope - including Grand Junction - carry codes closer to 815xx and 816xx.
Colorado's Major Metro Areas by Population
The chart below shows how population concentrates along Colorado's Front Range, with Denver's metro area far outpacing every other city in the state.
Denver's ZIP codes cover Colorado's capital and largest city, a major hub for aerospace, tech, and outdoor recreation industries that has drawn steady population growth for decades. Aurora, immediately to the east, has grown into one of the state's largest cities in its own right, while Colorado Springs, home to the US Air Force Academy and a large military presence, anchors the southern end of the Front Range corridor. For a broader national comparison, our full US ZIP code directory lays out every state's ranges side by side.
Mountain Resort Towns and the High Country
West of Denver, Colorado's mountain corridor is home to some of the country's most famous ski resort towns - Aspen, Vail, Breckenridge, and Telluride among them. ZIP codes here often have small year-round populations but see enormous seasonal swings, with winter ski traffic and summer tourism driving local economies far beyond what permanent resident counts would suggest. Property values in these ZIP codes also rank among the highest in the state, disproportionate to their population size.
The Eastern Plains and Rural Colorado
East of the Front Range, Colorado's eastern plains stretch out toward the border with Kansas and Nebraska, covered by ZIP codes with agricultural economies built around wheat and cattle. This flat, wide-open terrain looks and feels a world apart from the mountain resort towns further west, despite belonging to the same state, and population density here drops sharply compared to the Front Range corridor.
Why ZIP Codes Matter Beyond Mail
In Colorado, ZIP codes carry particular weight in the real estate and insurance markets. Mountain resort ZIP codes see some of the highest property values in the state, while Front Range suburbs use ZIP-level data to signal school district quality amid rapid growth. Insurers increasingly rely on ZIP codes near the wildland-urban interface, particularly in the foothills west of Denver and Colorado Springs, to assess wildfire risk - a growing concern as development pushes further into forested terrain.
Border Regions and Neighboring States
Colorado shares borders with seven states, and its ZIP code patterns shift with the terrain in each direction. To the west, the border with Utah cuts through similar canyon and high-desert country. To the south, ZIP codes near New Mexico reflect a shared high-plains and mountain landscape. And to the east, the transition into Kansas and Nebraska's flat agricultural plains happens gradually as elevation drops away from the Rockies.
Finding the Right ZIP Code
Use the list below to browse Colorado's ZIP codes by city, county, or population - sorted so the most populous areas surface first. Each entry links through to a detailed page with additional demographic data. If you're trying to identify the ZIP code for a specific address rather than browsing by city, the search tool at the top of this page will get you there faster than scrolling through the full list.
Frequently Asked Questions
How many ZIP codes does Colorado have?
Colorado has several hundred ZIP codes, concentrated heavily along the Front Range corridor from Fort Collins to Colorado Springs, with far fewer covering the mountain and eastern plains regions.
What ZIP code range does Colorado use?
Colorado ZIP codes generally fall between 80000 and 81699, with Denver toward the lower end and the Western Slope and mountain resort areas further along the range.
Which Colorado city has the most ZIP codes?
Denver and its surrounding metro area, including Aurora and the Front Range suburbs, account for the largest number of individual ZIP codes.
Can I look up a Colorado ZIP code by city name?
Yes, use the search tool on this page or browse the full list below, which is organized by city and sorted by population.
Whether you're relocating to the Front Range corridor, researching property in a mountain resort town, or simply trying to pin down the right ZIP code for a specific Colorado address, the data below covers every corner of the state - from downtown Denver to the high peaks and eastern plains.