Mason City, IA micro area ZIP codes
The Mason City, IA micropolitan statistical area (CBSA 32380) covers 2 counties in Iowa and 17 ZIP codes.
- ZIP codes
- 17
- Population
- 48,859
- Avg. median income
- $71,300population-weighted
- Counties
- 2
Click anywhere on the map to see which ZIP code it's in.
Counties in the Mason City, IA area
- Cerro Gordo County, IA (central)
- Worth County, IA
ZIP codes in the Mason City, IA area
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 50401 | Mason City | Cerro Gordo County | 28,703 | $66,072 | $160,300 |
| 50402 PO Box | Mason City | Cerro Gordo County | — | — | — |
| 50428 | Clear Lake | Cerro Gordo County | 9,071 | $81,037 | $339,500 |
| 50433 | Dougherty | Cerro Gordo County | 157 | $69,167 | $227,400 |
| 50434 | Fertile | Worth County | 396 | — | $179,400 |
| 50440 | Grafton | Worth County | 361 | $76,429 | $181,500 |
| 50444 | Hanlontown | Worth County | 394 | $78,214 | $208,500 |
| 50446 | Joice | Worth County | 476 | $107,000 | $204,000 |
| 50448 | Kensett | Worth County | 620 | $62,059 | $183,200 |
| 50456 | Manly | Worth County | 1,699 | $81,339 | $152,800 |
| 50459 | Northwood | Worth County | 3,045 | $71,618 | $204,400 |
| 50464 | Plymouth | Cerro Gordo County | 694 | $91,750 | $199,400 |
| 50467 | Rock Falls | Cerro Gordo County | 63 | $63,750 | $150,000 |
| 50469 | Rockwell | Cerro Gordo County | 1,527 | $71,250 | $213,600 |
| 50477 | Swaledale | Cerro Gordo County | 250 | $52,321 | $83,000 |
| 50479 | Thornton | Cerro Gordo County | 655 | $68,750 | $158,600 |
| 50482 | Ventura | Cerro Gordo County | 748 | $98,289 | $321,800 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Frequently asked questions
How many ZIP codes are in the Mason City, IA micro area?
17 ZIP codes, based on each ZIP code's main county.
Which counties make up the Mason City, IA area?
Cerro Gordo County and Worth County.
What is an MSA?
A metropolitan statistical area (MSA) is a core city of 50,000+ people plus the surrounding counties tied to it by commuting, as defined by the U.S. Office of Management and Budget. Micropolitan areas have a core of 10,000–50,000. Together they are called core-based statistical areas (CBSAs).