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/991

ZIP codes starting with 991

ZIP codes
67
States
WA
Largest city
Pullman, WA
Population
121,262

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 991xx

ZIP codes starting with 991
ZIP City Type Population Median income Median home
99101 Addy , WA Standard 1,690 $78,750 $434,800
99102 Albion , WA Standard 495 $56,833 $230,700
99103 Almira , WA Standard 556 $53,125 $230,900
99104 Belmont , WA No street area — — —
99105 Benge , WA Standard 41 $51,250 $46,500
99107 Boyds , WA No street area — — —
99109 Chewelah , WA Standard 4,981 $62,391 $327,400
99110 Clayton , WA Standard 1,505 $76,106 $453,100
99111 Colfax , WA Standard 4,038 $73,393 $295,800
99113 Colton , WA Standard 560 $104,643 $398,000
99114 Colville , WA Standard 13,383 $62,711 $301,600
99115 Coulee City , WA Standard 1,369 $62,708 $247,200
99116 Coulee Dam , WA Standard 1,786 $65,946 $238,900
99117 Creston , WA Standard 556 $63,750 $265,700
99118 Curlew , WA Standard 899 $68,875 $323,800
99119 Cusick , WA Standard 1,549 $95,385 $360,200
99121 Danville , WA Standard 262 — $392,000
99122 Davenport , WA Standard 4,046 $82,386 $331,700
99123 Electric City , WA Standard 977 $87,841 $245,600
99124 Elmer City , WA Standard 326 $70,000 $201,600
99125 Endicott , WA Standard 611 $52,569 $195,800
99126 Evans , WA Standard 899 — $366,000
99128 Farmington , WA Standard 259 $58,942 $363,500
99129 Fruitland , WA Standard 725 $40,938 $220,000
99130 Garfield , WA Standard 693 $82,000 $232,100
99131 Gifford , WA Standard 127 $35,391 $245,800
99133 Grand Coulee , WA Standard 1,115 $68,854 $229,900
99134 Harrington , WA Standard 595 $41,774 $285,200
99135 Hartline , WA Standard 395 $80,469 —
99136 Hay , WA Standard 14 $87,708 —
99137 Hunters , WA Standard 495 $50,972 $337,000
99138 Inchelium , WA Standard 1,223 $50,833 $218,100
99139 Ione , WA Standard 1,091 $52,404 $274,100
99140 Keller , WA Standard 486 $53,529 $140,700
99141 Kettle Falls , WA Standard 5,626 $58,302 $320,700
99143 Lacrosse , WA Standard 585 $38,214 $123,600
99144 Lamona , WA Standard 7 — —
99146 Laurier , WA Standard 28 — —
99147 Lincoln , WA Standard 214 $84,063 $436,700
99148 Loon Lake , WA Standard 2,794 $67,431 $429,900
99149 Malden , WA Standard 100 $26,250 $49,500
99150 Malo , WA Standard 351 $61,833 $332,400
99151 Marcus , WA Standard 242 $55,489 $169,400
99152 Metaline , WA Standard 157 $66,250 $232,500
99153 Metaline Falls , WA Standard 467 $44,000 $282,400
99154 Mohler , WA Standard 14 — —
99155 Nespelem , WA Standard 1,009 $50,909 $143,100
99156 Newport , WA Standard 9,195 $65,271 $378,400
99157 Northport , WA Standard 605 $43,650 $232,600
99158 Oakesdale , WA Standard 561 $78,375 $301,800
99159 Odessa , WA Standard 1,323 $64,688 $241,000
99160 Orient , WA Standard 87 — under $10,000
99161 Palouse , WA Standard 1,435 $87,464 $302,600
99163 Pullman , WA Standard 34,022 $48,231 $435,900
99164 Pullman , WA No street area — — —
99166 Republic , WA Standard 2,953 $56,676 $286,000
99167 Rice , WA Standard 871 $70,364 $285,000
99169 Ritzville , WA Standard 2,587 $66,061 $228,400
99170 Rosalia , WA Standard 926 $58,750 $238,300
99171 Saint John , WA Standard 895 $53,333 $220,500
99173 Springdale , WA Standard 1,623 $60,000 $281,600
99174 Steptoe , WA Standard 69 $50,179 $254,500
99176 Thornton , WA Standard 163 $128,000 $283,300
99179 Uniontown , WA Standard 645 $79,063 $397,700
99180 Usk , WA Standard 465 $63,750 $428,700
99181 Valley , WA Standard 1,995 $63,661 $267,600
99185 Wilbur , WA Standard 1,501 $73,094 $248,100

Cite this page

zipcodes.pro. “ZIP codes starting with 991.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/991

Underlying data is public domain or openly licensed — sources, vintages and licences.