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| Alphabetical | By Popularity (What's This?) | | - Addresses.com: ZIP Code Lookup
 - Find ZIP codes by United States city or state, or use the reverse ZIP code locator to find what location corresponds to a given ZIP code. - Area Codes - Zip Codes
- Look up U.S. area codes and ZIP codes, or find postal and phone information for a town, city, or county.
- Australian Post Code Search
- Lookup post codes for areas in Australia, or find the area that corresponds to a given post code.
- Canada Post Corporation@
- Carrier Routes by ZIP Code
- Lists postal carrier routes for a given ZIP code, including the number of residences and businesses on the route and the delivery post office.
- Carrier Routes in a Radius
- Displays a list of postal carrier routes within a radius from a given address.
- Conversion of German ZIP Codes
- Jay Computer Services: ZIP and Area Codes
- ZIP code and area code lookup and conversion database. Includes reverse area code lookup and Canadian postal codes.
- Mailbox Map - USPS mailbox locator that uses an interactive map
- National Address and ZIP+4 Browser
- ZIP code finder for addresses in the U.S., showing nearby addresses, similarly spelled streets and cities, and a list of standard address abbreviations.
- National Address Server
- Enter a partial U.S. postal address and the server attempts to rewrite the address in the proper format along with the ZIP+4 code.
- Philippines Zip Codes
- Browsable list of Metro Manila and provincial zip codes.
- PickTrue.com: Zip Code Finder
- Provides a full list of ZIP codes in the United States by state, city, or county.
- Postage Rate Calculator
- Calculate domestic or international postage with this tool from the U.S. Postal Service. Select your mail's destination, shape, size, and weight to get a postage quote. Also includes a ZIP code lookup.
- Postal Rates.info
- Guide to to postal authorities, post and ZIP codes, stamps, and philately around the world.
- Postal Service Finder
- Web directory of postal service information for the U.S. and worldwide, organised by region.
 Singapore Post: Postal Code Enquiry
- Find postal and address information for locations in Singapore.- Singapore Post: Postal Rates
- U.S. State Abbreviations (11)
- USAZipInfo.com
- Provides lists of ZIP codes by state, city, county, and area code.
- USPS Postal Rates
- Information about postage rates for domestic, international, and business mail from the U.S. Postal Service. Includes links to online postage rate calculators.
- USPS: ZIP Code Look-Up and Address Information
- Find the ZIP code for a given address, search by city or company, or find all cities in a ZIP code. From the U.S. Postal Service.
- USZip.com
- Instant ZIP code search including U.S. census data that can be searched by ZIP code or city name.
- Wikipedia: ZIP Code
- Encyclopedia article about the history and uses of the United States postal codes. Also includes lists of zip codes by state and postal codes by country.
- ZIP Code Distance and Radius Search
- Find the distance between two ZIP codes or find all the ZIP codes within a given radius.
- ZIP Code Look-Up and Address Information
- Find the ZIP code for a given address, search by city or company, or find all cities in a ZIP code. From the U.S. Postal Service.
- ZIP Codes and Postal Codes of the World
- Gives links to postcodes and ZIP codes by nation, post office home pages, and other addressing and postal information. From EmbassyWorld.com.
- Zip-Code-Database.Org
- Find ZIP codes and postal information for all 50 U.S. States. Includes ZIP code search by city and by area code.
- ZipDecode
- Java-based map of the continental U.S. that progressively narrows down the area covered by a ZIP code as you type in the numbers one by one.
- ZIPskinny
- Compare educational data, demographics, income, education, and occupation for up to 20 different zip codes at a time.
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