Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — PREFIX/999

ZIP codes starting with 999

ZIP codes
13
States
AK
Largest city
Ketchikan, AK
Population
20,892

The first three digits of a ZIP code identify a sectional center facility — the postal processing plant that sorts mail for the area. It is a mail-routing grouping, not an administrative boundary.

Every ZIP code in 999xx

ZIP codes starting with 999
ZIP City Type Population Median income Median home
99901 Ketchikan , AK Standard 13,768 $92,885 $393,300
99903 Meyers Chuck , AK Standard 1 — —
99918 Coffman Cove , AK Standard 269 $62,917 $250,000
99919 Thorne Bay , AK Standard 570 $61,250 $290,000
99921 Craig , AK Standard 1,596 $64,250 $302,900
99922 Hydaburg , AK Standard 375 $46,875 $105,900
99923 Hyder , AK Standard 24 — —
99925 Klawock , AK Standard 841 $61,250 $278,100
99926 Metlakatla , AK Standard 1,334 $72,279 $167,600
99927 Point Baker , AK Standard 27 — —
99928 Ward Cove , AK No street area — — —
99929 Wrangell , AK Standard 2,087 $64,375 $296,800
99950 Ketchikan , AK No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 999.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/999

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