zip codes by state
ZIP Codes by State
Study the 60 ZIP/ZCTA records used by USGuess. These are representative learning points for the quiz, not a complete ZIP directory or USPS delivery-boundary map.
code bank
60 ZIP codes
state spread
38 states/DC
Each state group uses one or more representative city-center or regional points from the launch bank.
region spread
Four regions
state groups
Grouped by state
Use these groups to review which representative area each ZIP prompt points to before returning to the map quiz.
Alabama
2 codesArizona
1 codeArkansas
2 codesCalifornia
4 codesColorado
2 codesDistrict of Columbia
1 codeFlorida
4 codesGeorgia
2 codesIllinois
1 codeIndiana
1 codeIowa
1 codeKansas
1 codeKentucky
1 codeLouisiana
1 codeMaine
1 codeMaryland
1 codeMassachusetts
1 codeMichigan
1 codeMinnesota
1 codeMississippi
1 codeMissouri
2 codesNevada
1 codeNew Hampshire
1 codeNew Mexico
1 codeNew York
4 codesNorth Carolina
2 codesNorth Dakota
1 codeOhio
2 codesOklahoma
1 codeOregon
1 codePennsylvania
2 codesSouth Carolina
1 codeTennessee
2 codesTexas
4 codesUtah
1 codeVermont
1 codeWashington
1 codeWisconsin
2 codeszip code study list
60-code launch reference
The list preserves the representative area used by the quiz. It should not be treated as a USPS delivery route, a street-address lookup table, or a complete national ZIP code directory.
source checks
Source group made visible
ZIP code records use the `us-census-zcta-gazetteer` source group. Census ZCTA/Gazetteer references support map-friendly learning points; USPS lookup stays a postal guardrail, not a copied boundary source.
Defines ZCTAs as Census geographic products used for mapping and analysis of ZIP code patterns.
Census Gazetteer FilesPublic Census reference hub for national and state Gazetteer files, including ZIP/ZCTA-style geography files.
USPS ZIP Code LookupPostal lookup reference for address, city/state, and covered-city checks; not used as a boundary map source.
source and asset policy
Representative points only
ZIP code records are a manually reviewed launch seed checked against Census ZIP Code Tabulation Area and Gazetteer references with representative city coordinates.
USGuess does not use USPS proprietary ZIP databases, carrier route data, delivery-route maps, customer address data, or copied postal/third-party ZIP boundary maps as quiz material.
Census Gazetteer files