The ZIP+4 Code is not required and is usually calculated automatically when the mail is sorted and processed. The full ZIP Code identifies a small mail delivery segment such as a street, a city block, a group of apartments, or even an individual street address that receives a high volume of mail. A ZIP+4 Code uses the basic five-digit code plus four additional digits for a full 9-digit ZIP Code. In 1983, the USPS moved to the next generation of ZIP Codes and changed its system to include the new ZIP+4. InĬross county lines, Smarty ( formerly SmartyStreets) displays the default county in the line labeled ‘County Name’ and includes an additional line labeled ‘Alternate Counties.’ You can see our instructions on how to find a county by ZIP Code. They are based on sparse mail delivery routes, so the boundary between ZIP Code areas there is indefinite. Similarly, areas without regular postal routes (rural route areas) or areas with no mail delivery (undeveloped areas,) are not assigned ZIP Codes. For example, ZIP Codes that start with 095 are assigned to the Navy and therefore have no geographic location. Because of this, ZIP Code "areas" can overlap, be contained within another ZIP Code, or have no geographic area. ZIP Codes denote street address groups or delivery routes. 97635 includes portions of Lake County, Oregon, and Modoc County, California.Īlthough most ZIP Codes can be roughly assigned to a geographic area,Ĭodes do not represent geographic regions.42223 spans Christian County, Kentucky, and Montgomery County, Tennessee.In fact, since they are designed only to increase mailing efficiency, ZIP Codes can and do cross county and state boundaries. ZIP Codes aren't drawn according to state boundaries. Received with a ZIP Code of 47722, the USPS can know that it's in Indiana (4), it's in Vanderburgh county (77), and it's in theĪrea of the University of Evansville (22). The fourth and fifth digits of the ZIP Code represent the area of the city or town. Is assigned ZIP Codes beginning with 220, 221, 222, and 223. For example, the Northern Virginia sectional center facility in Merrifield Have multiple three-digit codes assigned to them. This facility is the mail sorting and distribution center for a zone or area. The first three digits of a ZIP Code together usually indicate theĬentral mail processing facility, also referred to as a sec center or sectional center facility to which that ZIP Code belongs. After that, the ZIP Codes will proceed alphabetically. The USPS often assigns the first ZIP Code to a region's main town or city. After the first number in a ZIP Code is assigned based on the National Area, the USPS assigns the next two numbers according to a city. Islands, Oregon, Palau, Washington, Army Post Office Pacific, Fleet Post Office Pacific Iowa, Minnesota, Montana, North Dakota, South Dakota, WisconsinĪrizona, Colorado, Idaho, New Mexico, Nevada, Utah, WyomingĪlaska, American Samoa, California, Guam, Hawaii, Marshall Islands, Federated States of Micronesia, Post Office Europe, Fleet Post Office Europeĭistrict of Columbia, Maryland, North Carolina, South Carolina, Virginia, West VirginiaĪlabama, Florida, Georgia, Mississippi, Tennessee, Army Post Office Americas, Fleet Post Office The first digit of the ZIP Code allocates as follows:Ĭonnecticut, Massachusetts, Maine, New Hampshire, New Jersey, Puerto Rico, Rhode Island, Vermont, The image in this section is a ZIP Code map of all 10 US postal zones or regions. Starting in the northeast, they are numberĠ-9. United States Postal Service (USPS) has segmented the country into 10 ZIP Code areas. There are three main parts of the 5-digit ZIP Code-the national area, the region or city, and the delivery area. Like the US, most countries haveįor example, India calls its postal codes ‘Postal Index Numbers,’ and The Czechia calls theirs ‘Postal Routing Numbers.’ So, when you hear ‘Eircode,’ think ‘Ireland,’ and ‘ZIP Code,’ think ‘The United States.’ "ZIP Code" is the name of the postal code system for the United States. ZIP Codes are 5-digit numbers developed by the United States Postal Service to represent individual post officesĪcross the United States. What Is a ZIP Code, and How Do ZIP Codes Work?Ĭlick to See Large ZIP Code Map (3840×2490px) What Is a ZIP Code, and How Do ZIP Codes Work?.
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