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/611

ZIP codes starting with 611

ZIP codes
19
States
IL
Largest city
Rockford, IL
Population
224,361

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 611xx

ZIP codes starting with 611
ZIP City Type Population Median income Median home
61101 Rockford , IL Standard 19,318 $46,163 $90,600
61102 Rockford , IL Standard 15,937 $46,599 $98,900
61103 Rockford , IL Standard 22,869 $51,161 $115,500
61104 Rockford , IL Standard 17,222 $33,772 $90,100
61105 Rockford , IL No street area — — —
61106 Rockford , IL No street area — — —
61107 Rockford , IL Standard 30,765 $78,574 $175,400
61108 Rockford , IL Standard 30,355 $64,415 $144,800
61109 Rockford , IL Standard 26,768 $62,973 $139,400
61110 Rockford , IL No street area — — —
61111 Loves Park , IL Standard 23,286 $61,393 $158,600
61112 Rockford , IL Standard 152 $40,563 —
61114 Rockford , IL Standard 15,325 $85,568 $204,300
61115 Machesney Park , IL Standard 22,364 $75,363 $172,600
61125 Rockford , IL No street area — — —
61126 Rockford , IL No street area — — —
61130 Loves Park , IL No street area — — —
61131 Loves Park , IL No street area — — —
61132 Loves Park , IL No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 611.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/611

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