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/811

ZIP codes starting with 811

ZIP codes
32
States
CO
Largest city
Alamosa, CO
Population
73,976

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 811xx

ZIP codes starting with 811
ZIP City Type Population Median income Median home
81101 Alamosa , CO Standard 15,550 $54,844 $240,400
81102 Alamosa , CO No street area — — —
81120 Antonito , CO Standard 1,832 $47,546 $188,200
81121 Arboles , CO Standard 376 $42,813 $332,000
81122 Bayfield , CO Standard 8,838 $93,714 $459,800
81123 Blanca , CO Standard 606 $36,487 $152,400
81124 Capulin , CO Standard 259 $88,793 $79,300
81125 Center , CO Standard 3,362 $56,250 $148,700
81126 Chama , CO Standard 506 $52,870 $170,400
81128 Chromo , CO Standard 34 $250,000+ —
81129 Conejos , CO Standard 118 — —
81130 Creede , CO Standard 727 $54,730 $406,100
81131 Crestone , CO Standard 1,051 $45,156 $333,500
81132 Del Norte , CO Standard 3,252 $55,000 $209,500
81133 Fort Garland , CO Standard 1,085 $45,833 $273,400
81135 Homelake , CO No street area — — —
81136 Hooper , CO Standard 305 $47,448 $193,300
81137 Ignacio , CO Standard 5,571 $63,860 $335,300
81138 Jaroso , CO Standard 17 — —
81140 La Jara , CO Standard 1,893 $46,781 $239,700
81141 Manassa , CO Standard 1,406 $59,539 $202,500
81143 Moffat , CO Standard 796 $30,915 $168,600
81144 Monte Vista , CO Standard 6,543 $64,662 $234,200
81146 Mosca , CO Standard 637 $69,556 $232,100
81147 Pagosa Springs , CO Standard 13,091 $84,270 $486,000
81148 Romeo , CO Standard 387 $45,469 $123,800
81149 Saguache , CO Standard 1,183 $57,019 $197,700
81151 Sanford , CO Standard 1,716 $43,417 $188,500
81152 San Luis , CO Standard 1,244 $31,875 $120,300
81154 South Fork , CO Standard 1,363 $77,177 $511,300
81155 Villa Grove , CO Standard 228 $75,000 $609,800
81157 Pagosa Springs , CO No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 811.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/811

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