Section
ZIP Codes
City ZIP code lookups, sourced from USPS/Census-derived postal data -- full lists, county breakdowns, and the edge cases (unique-purpose ZIPs, cross-county splits) most lists skip.
Index
01 Andover MA ZIP Code: 01810 Plus Four Special Codes GeoNames lists five Andover, MA place-name ZIP rows in Essex County: 01810, 01812, 01899, 05501, and 05544. North Andover is a separate place (01845). 02 Apple Valley MN ZIP Code: 55124 Under Saint Paul Place Name Apple Valley, Minnesota uses ZIP 55124 in Dakota County. GeoNames' US export lists that code under the place name Saint Paul, not Apple Valley. 03 Ames Iowa ZIP Code: All 5 in Story County GeoNames lists five ZIP codes with Ames, IA as the primary place name: 50010 through 50014, all in Story County. Standard vs unique codes and area code 515. 04 Amherst MA ZIP Code: 01002, 01003, 01004 in Hampshire GeoNames lists three ZIP codes with Amherst, MA as the primary place name (01002, 01003, 01004), all in Hampshire County, plus how North Amherst 01059 differs. Area code 413. 05 What Is My ZIP Code Extra 4 Digits? ZIP+4 Explained The extra four digits after a US ZIP code are ZIP+4: sector then segment. How they work, why the hyphen is required, and how to look yours up. 06 Gulfport MS ZIP Codes: All 6 in Harrison County Gulfport, Mississippi uses six ZIP codes (39501-39503, 39505-39507): three standard delivery codes and three PO Box codes, all in Harrison County. 07 Delray Beach ZIP Codes: All 7 in Palm Beach County Delray Beach, FL has seven ZIP codes (33444-33446, 33448, 33482-33484): five standard delivery codes and two PO Box codes, all in Palm Beach County. 08 Beaverton OR ZIP Codes: All 10 in Washington County Beaverton, Oregon has ten ZIP codes (97003, 97005-97008, 97075-97079): six standard, two PO Box and two unique codes, all in Washington County. 09 Postal Code vs ZIP Code: Same Field, Different Rules A ZIP code is the United States' postal code. How the US, Canadian and UK formats differ, what ZIP+4 adds, and which one to type when a form says "postal code." 10 Chesapeake VA ZIP Codes: All 9, and Why There Is No County Chesapeake, VA uses nine ZIP codes, 23320 through 23328: six street-delivery codes, two PO Box codes and one unique code. Why the county field is the city. 11 Atlanta ZIP Codes: The Full List by County Every ZIP code USPS assigns to Atlanta, Georgia, which county each one sits in, and the one Atlanta ZIP that belongs to the IRS, not a neighborhood. 12 New York City ZIP Codes: All 311, by Borough NYC's five boroughs use 311 ZIP codes, and Queens is the only one where the map runs on neighborhood names, not the borough name itself. 13 Texas ZIP Codes: How the State's 2,600 Codes Are Organized Texas doesn't have one ZIP code system, it has a range spanning 73301 to 88595, and the major city with the most ZIP codes isn't the one with the most people. 14 Dallas ZIP Codes: The Full List by County Every ZIP code USPS assigns to Dallas sits in Dallas County, but four belong to Highland Park, a 2.2-square-mile town independent of Dallas since 1915. 15 Chicago ZIP Codes: The Full List, and the 28 That Aren't a Neighborhood at All Every Chicago ZIP code sits in Cook County, but a third aren't neighborhoods. They're dedicated codes for O'Hare, downtown banks, and an electric utility. 16 Austin ZIP Codes: The Full List, Two Counties, and Two That Belong to the IRS USPS assigns Austin 74 ZIP codes (72 in Travis County and 2 in Williamson), plus two non-geographic codes reserved for the IRS, numbered in a block that looks like it belongs to Puerto Rico. 17 Los Angeles ZIP Codes: The Full List, and Why Venice, Van Nuys, and San Pedro Aren't On It Los Angeles has 94 ZIP codes that carry the city's own name, and dozens more inside its borders that carry a neighborhood's instead, a split rooted in a 1915 water-rights annexation vote. 18 Boston ZIP Codes: The Full List, City Hall's Own Code, and Six Annexed Towns USPS assigns 36 ZIP codes to "Boston, MA," but City Hall, a federal building, and six once-independent towns that Boston annexed tell the rest of the story. 19 Nashville ZIP Codes: The Full List, and Why Metro's Satellite Cities Share It USPS assigns 39 ZIP codes to Nashville, all in Davidson County, home to the first true city-county merger in the US, and five satellite cities without a ZIP of their own. 20 Denver ZIP Codes: The Full List, and the 11 That Sit Outside Denver County Every ZIP code USPS assigns to Denver, CO, and why 11 of the 66 sit in Jefferson or Adams County, not Denver County, despite the city's 1902 consolidation. 21 Houston ZIP Codes: The Full List, and the Independent City Filed Under Houston's Name Houston has 178 ZIP codes in two postal blocks, and one of them, 77005, belongs to a city that has never joined Houston, while its equally independent neighbor Bellaire got a ZIP name of its own instead. 22 Las Vegas ZIP Codes: The Full List, and the Strip That Isn't Really in the City Las Vegas has 77 ZIP codes, and the Strip's own code, 89109, is split between Paradise and Winchester, two unincorporated towns Clark County created to keep the resort corridor out of the city's tax base. 23 Sacramento ZIP Codes: The Full List, and the 59 That Never Reach a House Sacramento has 100 ZIP codes, but 59 sit in a block state agencies use for tax filings and other high-volume mail; only 41 actually cover the city's homes and businesses. 24 San Diego ZIP Codes: The Full List, and the Three That Belong to a Military Base San Diego has 76 ZIP codes, and every one sits inside San Diego County, with no split like this site's Denver or Atlanta lists. Three of them, though, belong to a Navy or Marine base instead of a neighborhood. 25 Why Does My ZIP Code Show the Wrong City? USPS assigns every ZIP code one official "preferred place name," tied to the post office that services it, not the town the address sits in. That mismatch is documented nationwide, and it recently derailed a Colorado real estate listing. 26 Kansas City ZIP Codes: Two Cities, Two States, Two Separate Lists Kansas City is really two cities in two states. Every ZIP for Kansas City, Missouri (71, three counties) and Kansas City, Kansas (15, one county). 27 Richmond, VA ZIP Codes: All 39, and How a City in No County Spills Into Two Richmond is one of Virginia's 38 independent cities, legally part of no county at all. Its ZIP codes don't honor that line: the full 39-code list, and why 10 of them are filed under Chesterfield or Henrico instead. 28 Phoenix ZIP Codes: All 77, and Why the List Never Crosses a County Line Phoenix has 77 ZIP codes, all inside Maricopa County, not because the city stayed small, but because it annexed nearly 500 square miles since 1950, faster than its ZIP list ever needed to reach a second county. 29 Cincinnati ZIP Codes: All 71, and Two That Aren't in Hamilton County Cincinnati's 71 ZIP codes almost all sit in Hamilton County, except one that's a 20,000-person Clermont County suburb, and one that's an 18-box mail drop with no residents at all. 30 Fresno ZIP Codes: The Full List, and Why Two-Thirds Aren't Delivery Routes All 58 ZIP codes USPS assigns to Fresno, California (entirely inside Fresno County), plus the 2010 split that created 93737 and the two ZIPs tied to an IRS tax-processing center that closed in 2021. 31 Huntsville, AL ZIP Codes: All 24, and the 7 That Aren't Neighborhoods All 24 ZIP codes USPS assigns to Huntsville, AL, including the 7 reserved for single addresses like a credit union and a university, and one that sits mostly on Redstone Arsenal. 32 Indianapolis ZIP Codes: All 63, and the Four Cities Unigov Never Absorbed Indianapolis's 63 ZIP codes mostly sit in Marion County, the result of a 1970 city-county merger that absorbed almost everything except four cities that still run their own police, fire, and mayor's office today. 33 Irvine, CA ZIP Codes: The Full List, and the $1 Land Sale That Started the City All 13 ZIP codes USPS assigns to Irvine, California, entirely inside Orange County, plus the 1960 sale that created UC Irvine and the Northpark strip that still dials on 714 instead of 949. 34 Long Beach, CA ZIP Codes: The Full List, From a City That Isn't a County Seat All 27 ZIP codes GeoNames assigns to Long Beach, California, why the city runs its own health department instead of routing through Los Angeles County, and which codes have almost no residents at all. 35 Lubbock ZIP Codes: All 26, and the Campus That Isn't the Unique One Every ZIP code USPS assigns to Lubbock, Texas, all inside Lubbock County, plus which of the three unique ones actually belongs to Texas Tech, and the area code that's gone unsplit since 1957. 36 Scottsdale, AZ ZIP Codes: The Real 15, and the One With a Phoenix Address USPS assigns 15 ZIP codes to Scottsdale, all inside Maricopa County, plus the one real estate agents call the 'Magic Zip Code' because it mails from Scottsdale while most of its homes sit inside Phoenix. 37 Augusta GA ZIP Codes: Full List by County Every ZIP with Augusta, GA as the primary place name in GeoNames, which county each sits in, and why 30907 disagrees across directories. 38 Boynton Beach ZIP Codes: All 9 in Palm Beach County Every ZIP with Boynton Beach, FL as the primary place name: six standard delivery codes plus three PO Box ZIPs, all in Palm Beach County per GeoNames. 39 Charleston WV ZIP Codes: Full List by Place GeoNames lists 45 ZIP rows with Charleston, WV as the primary place name, all in Kanawha County, plus how South Charleston differs. 40 What Is a ZIP+4 Code? ZIP+4 adds four digits after the basic five-digit ZIP to route mail to a segment of a street or a building. When USPS expects it, and when the five-digit ZIP alone is enough.