ZIP codes starting with 504
- ZIP codes
- 57
- States
- IA
- Largest city
- Mason City, IA
- Population
- 101,930
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 504xx
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
50401 | Mason City , IA | Standard | 28,703 | $66,072 | $146,500 |
50402 | Mason City , IA | No street area | — | — | — |
50420 | Alexander , IA | Standard | 473 | $76,250 | $101,600 |
50421 | Belmond , IA | Standard | 3,168 | $64,438 | $135,900 |
50423 | Britt , IA | Standard | 2,291 | $73,151 | $118,900 |
50424 | Buffalo Center , IA | Standard | 1,441 | $59,091 | $114,500 |
50426 | Carpenter , IA | Standard | 81 | $74,107 | $63,900 |
50427 | Chapin , IA | Standard | 137 | $73,091 | $94,000 |
50428 | Clear Lake , IA | Standard | 9,071 | $81,037 | $283,400 |
50430 | Corwith , IA | Standard | 520 | $59,265 | $75,700 |
50431 | Coulter , IA | Standard | 228 | $62,917 | $90,000 |
50432 | Crystal Lake , IA | Standard | 283 | $66,875 | $100,300 |
50433 | Dougherty , IA | Standard | 157 | $69,167 | $86,300 |
50434 | Fertile , IA | Standard | 396 | — | — |
50435 | Floyd , IA | Standard | 713 | $71,156 | $145,800 |
50436 | Forest City , IA | Standard | 5,771 | $74,940 | $167,900 |
50438 | Garner , IA | Standard | 3,995 | $70,350 | $197,600 |
50439 | Goodell , IA | Standard | 454 | $94,167 | $80,000 |
50440 | Grafton , IA | Standard | 361 | $76,429 | $122,500 |
50441 | Hampton , IA | Standard | 5,450 | $49,910 | $127,100 |
50444 | Hanlontown , IA | Standard | 394 | $78,214 | $146,900 |
50446 | Joice , IA | Standard | 476 | $107,000 | $154,200 |
50447 | Kanawha , IA | Standard | 1,145 | $76,019 | $86,800 |
50448 | Kensett , IA | Standard | 620 | $62,059 | $123,400 |
50449 | Klemme , IA | Standard | 785 | $59,524 | $94,800 |
50450 | Lake Mills , IA | Standard | 2,952 | $76,125 | $158,000 |
50451 | Lakota , IA | Standard | 432 | $53,750 | $53,300 |
50452 | Latimer , IA | Standard | 946 | $66,250 | $120,200 |
50453 | Leland , IA | Standard | 537 | $77,868 | $153,600 |
50454 | Little Cedar , IA | Standard | 229 | $63,864 | — |
50455 | Mc Intire , IA | Standard | 201 | $42,054 | $92,800 |
50456 | Manly , IA | Standard | 1,699 | $81,339 | $124,700 |
50457 | Meservey , IA | Standard | 463 | $47,250 | $90,800 |
50458 | Nora Springs , IA | Standard | 2,094 | $99,643 | $157,500 |
50459 | Northwood , IA | Standard | 3,045 | $71,618 | $149,600 |
50460 | Orchard , IA | Standard | 688 | $77,083 | — |
50461 | Osage , IA | Standard | 5,228 | $68,886 | $180,400 |
50464 | Plymouth , IA | Standard | 694 | $91,750 | $197,100 |
50465 | Rake , IA | Standard | 190 | $42,386 | $49,000 |
50466 | Riceville , IA | Standard | 1,972 | $56,728 | $209,800 |
50467 | Rock Falls , IA | Standard | 63 | $63,750 | $150,000 |
50468 | Rockford , IA | Standard | 1,617 | $73,403 | $173,700 |
50469 | Rockwell , IA | Standard | 1,527 | $71,250 | $211,700 |
50470 | Rowan , IA | Standard | 287 | $72,542 | $69,300 |
50471 | Rudd , IA | Standard | 740 | $93,542 | $132,500 |
50472 | Saint Ansgar , IA | Standard | 2,560 | $93,482 | $204,100 |
50473 | Scarville , IA | Standard | 219 | $50,227 | $140,500 |
50475 | Sheffield , IA | Standard | 1,446 | $70,938 | $165,300 |
50476 | Stacyville , IA | Standard | 706 | $62,188 | $119,500 |
50477 | Swaledale , IA | Standard | 250 | $52,321 | $83,000 |
50478 | Thompson , IA | Standard | 737 | $48,750 | $93,200 |
50479 | Thornton , IA | Standard | 655 | $68,750 | $121,100 |
50480 | Titonka , IA | Standard | 809 | $73,333 | $90,000 |
50481 | Toeterville , IA | No street area | — | — | — |
50482 | Ventura , IA | Standard | 748 | $98,289 | $238,000 |
50483 | Wesley , IA | Standard | 672 | $88,929 | $142,500 |
50484 | Woden , IA | Standard | 411 | $65,583 | $101,000 |
Cite this page
zipcodes.pro. “ZIP codes starting with 504.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/504
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