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Census tracts have well known/exact boundaries. ZIP codes are groups of lines whose exact structural definition is not officially established.

UnitedStatesZipCodes.org is the most comprehensive resource for United States zip code data.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Look Up a ZIP Code ? By Address. Enter a corporate or residential street address, city, and state to see a specific ZIP Code?. Find by Address. By City and State. Enter city and state to see all the ZIP Codes? for that city. Find by City & State. Cities by ZIP Code? Enter a ZIP Code? to see the cities it covers.

The 10 Most Desirable ZIP Codes in the U.S., New Report Finds 37128: Murfreesboro, Tennessee. 78641: Leander, Texas. 34747: Kissimmee, Florida. 77433: Cypress, Texas. 29486: Summerville, South Carolina. 75126: Forney, Texas TK. 78130: New Braunfels, Texas. 77494: Katy, Texas.

ZIP codes have nothing to do with the lines that define a county. One ZIP code could include addresses in multiple counties and a single county might include hundreds of ZIPs!

USPS.com When you land on the site you can search for a zip code by street address or city and state.

The highest ZIP Code number is 99950 in Ketchikan, AK.

Include leading characters in postal codes Select the cell or range of cells that you want to format.On the Home tab, click the Dialog Box Launcher.In the Category box, click Custom. In the Type list, type 0 followed by the postal code format that you want to use.

Zip codes are always 5 characters, hence you would need a CHAR datatype, rather than VARCHAR.