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/990

ZIP codes starting with 990

ZIP codes
32
States
WA
Largest city
Cheney, WA
Population
173,879

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 990xx

ZIP codes starting with 990
ZIP City Type Population Median income Median home
99001 Airway Heights , WA Standard 9,440 $62,518 $346,200
99003 Chattaroy , WA Standard 4,810 $77,129 $428,200
99004 Cheney , WA Standard 22,871 $67,337 $420,500
99005 Colbert , WA Standard 10,815 $125,530 $561,100
99006 Deer Park , WA Standard 16,177 $72,200 $419,600
99008 Edwall , WA Standard 317 $106,544 $508,300
99009 Elk , WA Standard 4,506 $81,809 $427,200
99011 Fairchild Air Force Base , WA Standard 2,931 $69,917 —
99012 Fairfield , WA Standard 1,167 $88,571 $333,700
99013 Ford , WA Standard 1,620 $49,518 $214,000
99014 Four Lakes , WA Standard 17 — —
99016 Greenacres , WA Standard 21,615 $103,472 $477,400
99017 Lamont , WA Standard 230 $58,958 $121,400
99018 Latah , WA Standard 272 $52,813 $210,700
99019 Liberty Lake , WA Standard 12,447 $120,053 $617,800
99020 Marshall , WA Standard 16 — —
99021 Mead , WA Standard 8,942 $85,489 $465,400
99022 Medical Lake , WA Standard 8,767 $93,812 $389,700
99023 Mica , WA Standard 800 $114,298 $735,300
99025 Newman Lake , WA Standard 5,668 $118,712 $517,100
99026 Nine Mile Falls , WA Standard 9,320 $100,599 $540,400
99027 Otis Orchards , WA Standard 5,992 $74,718 $444,500
99029 Reardan , WA Standard 2,116 $69,919 $343,700
99030 Rockford , WA Standard 919 $86,250 $362,200
99031 Spangle , WA Standard 1,251 $98,182 $423,500
99032 Sprague , WA Standard 1,018 $61,964 $205,400
99033 Tekoa , WA Standard 832 $58,750 $253,300
99034 Tumtum , WA Standard 198 — —
99036 Valleyford , WA Standard 1,581 $121,518 $647,300
99037 Veradale , WA Standard 16,522 $87,713 $459,500
99039 Waverly , WA Standard 166 $65,909 $225,000
99040 Wellpinit , WA Standard 536 $70,200 $182,100

Cite this page

zipcodes.pro. “ZIP codes starting with 990.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/990

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