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/455

ZIP codes starting with 455

ZIP codes
6
States
OH
Largest city
Springfield, OH
Population
99,954

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 455xx

ZIP codes starting with 455
ZIP City Type Population Median income Median home
45501 Springfield , OH Standard 0 — —
45502 Springfield , OH Standard 17,692 $88,988 $243,600
45503 Springfield , OH Standard 32,638 $59,595 $168,200
45504 Springfield , OH Standard 16,363 $69,960 $180,600
45505 Springfield , OH Standard 19,826 $43,819 $95,500
45506 Springfield , OH Standard 13,435 $42,104 $107,300

Cite this page

zipcodes.pro. “ZIP codes starting with 455.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/455

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