Ultimate Guide to U.S. State ZIP Codes: Complete List & Quick Reference

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When planning a road trip, shipping a package, or simply trying to locate a friend across the country, knowing the ZIP code for any U.S. state can be surprisingly helpful. ZIP codes, or Zone Improvement Plan codes, are five‑digit numbers assigned by the United States Postal Service (USPS) to streamline mail delivery and improve logistics. Each state has a distinct range of ZIP codes that not only identifies a geographic area but also provides insight into the regional distribution of services, demographics, and economic activity. This guide compiles a concise list of ZIP code ranges for every state, giving you a quick reference for any task that requires accurate postal information.

1. Alabama

Alabama’s ZIP codes begin at 35001 and extend up to 36925. The state’s range is split between the northern and southern regions, with the 35xxx series covering the north‑central area, and the 36xxx series covering the south‑western part. Knowing whether a ZIP code starts with 35 or 36 can help differentiate between cities such as Birmingham (35201) and Mobile (36601).

2. Alaska

Alaska’s ZIP code system is unique, starting at 99501 and ending at 99950. Because of its vast size and low population density, many ZIP codes cover extensive rural areas. For example, Anchorage uses 99501, while Juneau’s main ZIP is 99801. The state’s numbering also reflects the remote communities located far from the main highway corridors.

3. Arizona

Arizona’s ZIP code range spans from 85001 to 85999. The lower numbers (850xx) are concentrated in the Phoenix metropolitan area, whereas the higher numbers (856xx‑859xx) cover the eastern and western parts of the state, such as Tucson (85701) and Flagstaff (86001). The state’s range accommodates both densely populated cities and sprawling desert communities.

4. Arkansas

Arkansas ZIP codes run from 71601 to 72999. The 71xxx series primarily covers the north‑western and north‑central regions, including cities like Little Rock (72201). The 72xxx series is used throughout the rest of the state, such as Fayetteville (72701) and Fort Smith (72901), reflecting the state's diverse topography.

5. California

California’s ZIP code spectrum is the broadest, stretching from 90001 to 96162. The 90xxx series covers Los Angeles and surrounding areas, while 94xxx and 95xxx span San Francisco, the Central Valley, and the Sierra Nevada. The high 96xxx series is reserved for the far north and the Pacific Coast, including cities like Redding (96001) and Eureka (95501).

6. Colorado

Colorado’s ZIP codes fall between 80001 and 81658. Denver’s core uses 802xx (e.g., 80202), while the surrounding counties adopt the 80xxx series. Rural towns such as Durango (81301) and Grand Junction (81501) showcase the state’s varied geography from mountains to high plains.

7. Connecticut

Connecticut’s range starts at 06001 and ends at 06928. The 06xxx series covers the entire state, with the 060xx area centered around Hartford (06030) and the 068xx series representing the southern coastal towns, such as New Haven (06510). This compact numbering reflects the state’s small size and high population density.

8. Delaware

Delaware’s ZIP code set includes 19701 to 19980. The 197xx series covers northern and central Delaware, with Wilmington’s primary ZIP being 19801. The 198xx series covers the coastal and southern parts, such as Rehoboth Beach (19971). Despite its small area, Delaware’s numbering system is straightforward and easy to remember.

9. Florida

Florida’s ZIP codes range from 32004 to 34997, covering the entire state from the Panhandle to the Keys. The 32xxx series is used in the northwest, while the 33xxx and 34xxx series cover central and southern Florida, respectively. For instance, Miami’s core is 33101, whereas Tallahassee’s ZIP is 32301.