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/631

ZIP codes starting with 631

ZIP codes
68
States
MO
Largest city
Saint Louis, MO
Population
887,236

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 631xx

ZIP codes starting with 631
ZIP City Type Population Median income Median home
63101 Saint Louis , MO Standard 3,130 $66,678 $223,200
63102 Saint Louis , MO Standard 2,882 $65,527 $192,100
63103 Saint Louis , MO Standard 8,778 $40,943 $202,900
63104 Saint Louis , MO Standard 19,007 $68,764 $268,900
63105 Saint Louis , MO Standard 18,875 $116,439 $766,300
63106 Saint Louis , MO Standard 6,751 $20,679 $214,400
63107 Saint Louis , MO Standard 8,909 $43,625 $64,400
63108 Saint Louis , MO Standard 21,336 $55,147 $372,200
63109 Saint Louis , MO Standard 25,236 $69,938 $264,700
63110 Saint Louis , MO Standard 17,645 $81,655 $339,900
63111 Saint Louis , MO Standard 18,851 $47,039 $128,400
63112 Saint Louis , MO Standard 17,985 $45,542 $212,700
63113 Saint Louis , MO Standard 10,221 $39,913 $81,600
63114 Saint Louis , MO Standard 33,969 $55,870 $116,800
63115 Saint Louis , MO Standard 14,488 $30,622 $75,600
63116 Saint Louis , MO Standard 42,170 $61,433 $174,100
63117 Saint Louis , MO Standard 9,261 $90,921 $348,700
63118 Saint Louis , MO Standard 25,913 $57,762 $221,200
63119 Saint Louis , MO Standard 34,181 $106,183 $351,100
63120 Saint Louis , MO Standard 6,790 $35,176 $53,500
63121 Saint Louis , MO Standard 25,008 $42,701 $95,600
63122 Saint Louis , MO Standard 41,634 $136,385 $474,300
63123 Saint Louis , MO Standard 49,077 $77,055 $219,400
63124 Saint Louis , MO Standard 10,839 $193,942 $988,600
63125 Saint Louis , MO Standard 33,294 $61,624 $178,600
63126 Saint Louis , MO Standard 15,452 $98,852 $306,300
63127 Saint Louis , MO Standard 5,268 $122,663 $583,400
63128 Saint Louis , MO Standard 30,540 $92,359 $338,700
63129 Saint Louis , MO Standard 51,553 $94,888 $295,600
63130 Saint Louis , MO Standard 28,910 $85,823 $316,100
63131 Saint Louis , MO Standard 17,935 $225,493 $778,100
63132 Saint Louis , MO Standard 14,283 $87,385 $417,000
63133 Saint Louis , MO Standard 6,569 $39,293 $65,100
63134 Saint Louis , MO Standard 13,059 $44,680 $94,700
63135 Saint Louis , MO Standard 18,381 $52,328 $107,400
63136 Saint Louis , MO Standard 40,929 $41,154 $84,400
63137 Saint Louis , MO Standard 19,684 $43,422 $82,900
63138 Saint Louis , MO Standard 18,233 $56,096 $139,100
63139 Saint Louis , MO Standard 21,631 $75,757 $209,600
63140 Saint Louis , MO Standard 316 $45,568 $84,100
63141 Saint Louis , MO Standard 20,932 $133,851 $620,900
63143 Saint Louis , MO Standard 8,975 $65,861 $236,300
63144 Saint Louis , MO Standard 9,505 $104,438 $304,700
63145 Saint Louis , MO No street area — — —
63146 Saint Louis , MO Standard 30,678 $84,756 $301,700
63147 Saint Louis , MO Standard 8,173 $41,182 $79,000
63150 Saint Louis , MO No street area — — —
63151 Saint Louis , MO No street area — — —
63155 Saint Louis , MO Standard 0 — —
63156 Saint Louis , MO No street area — — —
63157 Saint Louis , MO No street area — — —
63158 Saint Louis , MO No street area — — —
63160 Saint Louis , MO No street area — — —
63163 Saint Louis , MO No street area — — —
63164 Saint Louis , MO No street area — — —
63166 Saint Louis , MO No street area — — —
63167 Saint Louis , MO No street area — — —
63169 Saint Louis , MO No street area — — —
63171 Saint Louis , MO No street area — — —
63177 Saint Louis , MO No street area — — —
63178 Saint Louis , MO No street area — — —
63179 Saint Louis , MO No street area — — —
63180 Saint Louis , MO No street area — — —
63182 Saint Louis , MO No street area — — —
63188 Saint Louis , MO No street area — — —
63195 Saint Louis , MO No street area — — —
63197 Saint Louis , MO No street area — — —
63199 Saint Louis , MO No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 631.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/631

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