100 Dumb US Laws (With Proof They Exist)
ZIP Codes in the USA, officially known as “Zone Improvement Plan” codes, were introduced in 1963 to streamline and accelerate mail delivery. A ZIP Code is a five-digit number that identifies a specific delivery area, such as a city, a neighborhood, or a particular post office. The first digit of the code designates the broad geographic region.
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How to Find a ZIP Code in the USA
The most reliable way to find a ZIP Code is through the official United States Postal Service website.
To locate a specific code, simply enter the street address. You can also search by city and U.S. state, or perform a reverse search to find the location associated with a known ZIP Code.
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What Is a ZIP Code in the USA?
✉️ How ZIP Codes Work
The standard ZIP Code consists of five digits that identify a specific geographic delivery area. For instance, the code 90254 for Hermosa Beach indicates the West Coast region (9) and the Inglewood distribution center (02).
In 1983, the USPS introduced the extended “ZIP+4” format to improve precision. This system adds four digits to pinpoint a specific location, such as a city block or an apartment building. For high-volume mail, a unique suffix is often used; for example, mail sent to a postmaster typically uses the extension 9998, while 9999 is reserved for “General Delivery,” meaning the mail is held at the post office for pickup.
The term “ZIP Code” is a registered trademark of the United States Postal Service (USPS).
🖊️ How to Correctly Write a ZIP Code
On an address line, the ZIP Code is placed immediately after the city and state abbreviation. Do not use a comma between the state and the ZIP Code. For example: Hermosa Beach CA 90254-3552.
📋 ZIP Code Assignment System
ZIP Codes are assigned based on a logical geographic pattern. The first digit represents a group of U.S. states, starting with zero on the East Coast and ending with nine on the West Coast. The second and third digits represent a Sectional Center Facility (SCF) region, while the fourth and fifth digits identify the specific post office or delivery zone.
First Digit States and Territories 0 Connecticut, Massachusetts, Maine, New Hampshire, New Jersey, Puerto Rico, Rhode Island, Vermont, Virgin Islands, Army Post Office Europe (AE), Fleet Post Office Europe (AE) 1 Delaware, New York, Pennsylvania 2 District of Columbia, Maryland, North Carolina, South Carolina, Virginia, West Virginia 3 Alabama, Florida, Georgia, Mississippi, Tennessee, Army Post Office Americas (AA), Fleet Post Office Americas (AA) 4 Indiana, Kentucky, Michigan, Ohio 5 Iowa, Minnesota, Montana, North Dakota, South Dakota, Wisconsin 6 Illinois, Kansas, Missouri, Nebraska 7 Arkansas, Louisiana, Oklahoma, Texas 8 Arizona, Colorado, Idaho, New Mexico, Nevada, Utah, Wyoming 9 Alaska, American Samoa, California, Guam, Hawaii, Marshall Islands, Federated States of Micronesia, Northern Mariana Islands, Oregon, Palau, Washington, Army Post Office Pacific (AP), Fleet Post Office Pacific (AP) -
Interesting ZIP Codes in the USA
00501
The lowest ZIP Code in the USA is assigned exclusively to the Internal Revenue Service (IRS) in Holtsville, New York, to handle tax returns.
06390
Although Fishers Island is legally part of New York State, it is only accessible via ferry from Connecticut. As a result, its mail is routed through Connecticut, and it is assigned a ZIP Code beginning with “06,” which is the prefix for Connecticut.
10001
ZIP Code 10001 covers the Chelsea neighborhood in Manhattan. It is home to one of the highest concentrations of businesses and organizations in the country, with approximately 7,200 entities registered to this code.
12345
This distinctive numerical sequence is a valid ZIP Code used by the General Electric facility in Schenectady, New York.
20252
This ZIP Code was designated for Smokey Bear, the U.S. Forest Service mascot. Due to the massive volume of fan mail generated by the wildfire prevention campaign, the USPS assigned Smokey his own unique code in 1964. While the code is technically located in Washington, D.C., it remains a historic symbol of the campaign’s success.
20500-0001
This specific ZIP+4 Code is reserved exclusively for the President of the United States. The First Lady utilizes a separate extension, 20500-0002. The standard ZIP Code for the White House complex is 20500.
90210
This Beverly Hills ZIP Code became globally famous following the success of the television series *Beverly Hills, 90210*.
99950
The highest standard geographic ZIP Code in the USA belongs to the Ketchikan area in Alaska.
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