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www.zip-codes.com/state/il.asp

List of all Zip Codes for the state of Illinois, IL. Includes all counties and cities in Illinois.

www.zip-codes.com/city/il-chicago.asp

ZIP-Codes.com Products. ZIP Code Database Get all US ZIP Codes and their information in one easy to use database. ZIP+4 ZIP Code Database Covering every address in the U.S., get the +4 information you need. Canadian Postal Code Database Get all Canadian Postal Codes and their information in one easy to use database. 2010 Census Database

www.unitedstateszipcodes.org

Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient. In most cases, addresses in close proximity to each other are grouped in the same ZIP code which gives the appearance that ZIP codes are defined by a clear geographic boundary. However, some ZIP codes have nothing to do with geogaphic areas.

tools.usps.com/go/ZipLookupAction!input.action

Cities by ZIP Code™ For more rapid delivery, please use the recommended or recognized city names whenever possible for this ZIP Code ™.

www.50states.com/zipcodes/illinois.htm

Illinois Zip Codes. Zip Code Search. Find zip codes fast with the Zip Code Search. Enter a city and state in the search box below to find all the zip codes in that city. City: State: Reverse Zip Code Search. Find cities fast with the Zip Code Search. Enter a zip code into the search box below to find all the cities in that zip code. Zip Code: ...

www.unitedstateszipcodes.org/il

Illinois ZIP code map and Illinois ZIP code list. View all zip codes in IL or use the free zip code lookup.

www.zip-codes.me

The ZIP Code is a unique number that distinguishes cities accross the world. Almost every country uses a ZIP Codes sytem, with some exceptions like Ireland or Hong Kong. The zip code can be formed by using letters and/or numbers; it all depends on the standard chosen by the country. US Zip Code. In the US, the zip codes, also know as ZIP Code 5 ...

smartystreets.com/docs/zip-codes-101

ZIP Codes 101. The "ZIP" in ZIP Code stands for "Zone Improvement Plan". A ZIP Code indicates the destination post office or delivery area to which a letter will be sent for final sorting for delivery. If you're simply wanting to get the ZIP Code of a specific address, try our free demo. And that's it. ZIP Codes designate delivery routes and areas.

en.wikipedia.org/wiki/ZIP_code

This also occurs in some rural areas where portions of one town have their mail delivered to other post offices. For example, while most of the town of Plainfield, Massachusetts is in ZIP Code 01070, some sections of town are in the ZIP Code area for the neighboring town of Cummington with ZIP Code 01026.

www.ciclt.net/sn/clt/capitolimpact/gw_ziplist.aspx?zip=604

Zip Code List Zip Code - 604 in Illinois. Zip Code City County; 60401: Beecher: Will County: 60402: Forestview: Cook County: 60402