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/525

ZIP codes starting with 525

ZIP codes
50
States
IA
Largest city
Ottumwa, IA
Population
109,893

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 525xx

ZIP codes starting with 525
ZIP City Type Population Median income Median home
52501 Ottumwa , IA Standard 30,371 $63,426 $122,700
52530 Agency , IA Standard 945 $98,125 $192,000
52531 Albia , IA Standard 6,036 $73,896 $162,100
52533 Batavia , IA Standard 1,201 $62,799 $126,800
52534 Beacon , IA Standard 321 $57,986 $75,700
52535 Birmingham , IA Standard 725 $75,000 $142,900
52536 Blakesburg , IA Standard 814 $75,000 $133,500
52537 Bloomfield , IA Standard 7,069 $74,432 $162,100
52540 Brighton , IA Standard 1,088 $55,000 $115,300
52542 Cantril , IA Standard 588 $65,000 $100,000
52543 Cedar , IA Standard 541 $83,511 —
52544 Centerville , IA Standard 8,121 $50,572 $116,900
52548 Chillicothe , IA Standard 83 $75,750 $85,000
52549 Cincinnati , IA Standard 487 $62,292 $88,600
52550 Delta , IA Standard 552 $57,745 $110,200
52551 Douds , IA Standard 782 $52,875 $97,000
52552 Drakesville , IA Standard 940 $75,000 $204,700
52553 Eddyville , IA Standard 1,846 $64,583 $150,000
52554 Eldon , IA Standard 1,078 $55,769 $82,400
52555 Exline , IA Standard 193 $36,161 $122,900
52556 Fairfield , IA Standard 11,448 $59,243 $166,800
52557 Fairfield , IA Standard 685 — —
52560 Floris , IA Standard 458 $116,500 $261,000
52561 Fremont , IA Standard 1,112 $76,058 $123,200
52562 Hayesville , IA Standard 52 — $69,000
52563 Hedrick , IA Standard 1,602 $98,438 $130,400
52565 Keosauqua , IA Standard 1,518 $62,992 $149,000
52566 Kirkville , IA Standard 266 $58,750 $93,300
52567 Libertyville , IA Standard 506 $81,985 $164,100
52568 Martinsburg , IA Standard 80 $44,375 $66,300
52569 Melrose , IA Standard 550 $51,477 $84,300
52570 Milton , IA Standard 1,130 $68,750 $79,000
52571 Moravia , IA Standard 1,660 $81,953 $197,800
52572 Moulton , IA Standard 844 $72,727 $93,800
52573 Mount Sterling , IA Standard 148 $35,179 $258,300
52574 Mystic , IA Standard 377 $46,625 $80,000
52576 Ollie , IA Standard 371 $63,750 $119,600
52577 Oskaloosa , IA Standard 14,585 $66,084 $163,300
52580 Packwood , IA Standard 711 $53,368 $116,200
52581 Plano , IA Standard 168 $55,000 $154,900
52583 Promise City , IA Standard 389 $52,083 $82,500
52584 Pulaski , IA Standard 420 $71,042 $108,200
52585 Richland , IA Standard 838 $75,809 $142,000
52586 Rose Hill , IA Standard 600 $53,125 $104,500
52588 Selma , IA Standard 91 $13,657 —
52590 Seymour , IA Standard 1,464 $66,833 $167,600
52591 Sigourney , IA Standard 2,721 $62,404 $156,500
52593 Udell , IA Standard 97 $66,875 $233,300
52594 Unionville , IA Standard 676 $75,938 $193,300
52595 University Park , IA Standard 545 $66,667 $104,800

Cite this page

zipcodes.pro. “ZIP codes starting with 525.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/525

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