Highest ZIP Code number - U.S. Postal Facts (2024)

FAQs

Highest ZIP Code number - U.S. Postal Facts? ›

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

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

The Post Office Department was founded in 1775 with Benjamin Franklin as the first Postmaster General. His annual salary was $1,000. Before 1971, the PMG was a Cabinet member. With Informed Delivery service, you can digitally preview your incoming mail and manage your packages from a computer, tablet or mobile device.

The largest ZIP Code in the contiguous U.S. is 89049, Tonopah, NV, at 10,821 square miles. Twenty-four of the top 25 largest ZIP Codes in the country are located in Alaska – ranging from the largest, 99734, at more than 30,000 square miles to 99741 at 7,600 square miles.

Unique ZIP Codes are used for governmental agencies, universities, businesses, or buildings receiving sufficiently high volumes of mail to justify the assignment to them of exclusive ZIP Codes.

America adopted the ZIP code, or the Zone Improvement Plan code, first in 1963. Since the zoning was implemented at the same time the first one would be with the lowest number. The first ever ZIP code was 00601, which is the zip code for Adjuntas, Puerto Rico.

There is no zip code 00000. Currently the lowest 5 digit zip code in use is 00501 and it is a unique zip (only a single destination, not a city or community) assigned to the the IRS mail processing center in Holtsville, New York.

Actually, zip code 99999 doesn't even exist. In fact, the highest real zip code is 99950, for Ketchikan, Alaska.

11111 is not a valid 5 digit ZIP Code, but there are valid ZIP Codes that start with 111: 11101, 11102, etc.

Who receives the most mail? ›

The top states for sending and receiving First Class mail were Maine, Montana, Minnesota, Missouri, Nebraska, New Hampshire, North Dakota, Pennsylvania, South Dakota and Vermont.

The Postal Service is the only organization in the country that has the resources, network infrastructure and logistical capability to regularly deliver to every residential and business address in the nation. The Postal Service has more than 200,000 vehicles, one of the largest civilian fleets in the world.

The USPS is often mistaken for a state-owned enterprise or government-owned corporation (e.g., Amtrak) because it operates much like a business. It is, however, an "establishment of the executive branch of the Government of the United States", (39 U.S.C.

The highest ZIP code is 99950, belonging to Ketchikan, Alaska, and the lowest is 00501 in Holtsville, New York. There are over 42,000 ZIP codes in the US. The 00501 zip code is for an IRS Service Center (along with 00544).

Where is the zip code 00001? ZIP area 00001 is located in the Dillingham Census Area, state of Alaska. Are there 6 digit zip codes?

1. Zip Code: 94027. Atherton is the most expensive zip code in the country. Located within San Mateo County in the Bay Area, Atherton is currently the most expensive zip code in the country, but the area is controversial.

In 1963 the Post Office Department introduced the Zone Improvement Plan (ZIP) Code as a means to allow mail sorting methods to become faster and eventually be automated, but the innovation also created unimagined socio-economic benefits as an organizing and enabling device.

The code became a tool for organizing and displaying demographic information while also allowing for the efficient sorting and dispatching of mail. Over the span of 50 years, the ZIP Code was expanded from 5 digits to 9 and then to 11, with each digit indicative of the address location.

[2] The first three digits of the ZIP code were invented by Robert A. Moon, who came up with a system for dividing the country into approximately 900 geographical areas. Eventually, H. Bentley Hahn contributed the fourth and fifth digits, which added further precision to geographic locales.

Answer and Explanation:

There are 100,000 possible 5-digit zip codes if digits can be repeated. For each of the 5 digits of the zip code, there are 10 possible digits we can use (0, 1, 2, 3, 4, 5, 6, 7, 8, 9).