Residential delivery area · Iowa
ZIP Code 50401: Mason City, IA
ZIP code 50401 uses the postal name Mason City, Iowa and lies entirely in Cerro Gordo County (Census 2020 ZIP-county file). About 29,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $66,072 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Mason City (19%) and Portland (under 1%); 81% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Mason City · its only residential ZIP
- County
- Cerro Gordo County
- Census places
- Mason City (19%); Portland (under 1%) census-designated place
- Micro area
- Mason City, IA
- House district
- IA-2 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 148.2 sq mi · 194 people per sq mi
- PO Box ZIPs
- 50402 also use the name Mason City
Where is ZIP code 50401?
50401 centers on 43.154°, -93.200° and covers 148.2 square miles of land plus 0.5 of water. It borders 8 ZIP codes: 50467, 50464, 50458, 50456, 50428, 50469, 50444, 50468.
The map draws ZIP code areas only. For the streets inside 50401, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 50401 compare with the rest of Cerro Gordo County?
| Measure | 50401 | In Cerro Gordo County | In IA |
|---|---|---|---|
| People (ACS 2020-2024) | 28,703 | 1st of 17 | 26th of 970 |
| Median household income | $66k | 6th of 6 | 303rd of 396 |
| Median home value | $147k | 5th of 6 | 337th of 423 |
Its median household income is higher than in 40% of U.S. residential ZIP codes, and it is denser than 62% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 50401?
The 2020 Census counted 28,981 people in 50401; the ACS, which samples households over 2020-2024, estimates 28,703. Between the 2010 and 2020 censuses its population fell 2.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 28,703
- 2020 Census count
- 28,981−2.9% since 2010 (29,837)
- Households
- 13,321
- Median age
- 42.2
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 50401?
Of the 28,703 people the ACS estimates in 50401, 21.1% are under 18 and 22.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (85.5%).
- Under 1821.1%
- 18 to 6456.3%
- 65 and older22.6%
- White, not Hispanic85.5%
- Hispanic or Latino6.7%
- Other or two or more3.9%
- Black, not Hispanic2.7%
- Asian, not Hispanic1.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 50401 earn?
Median household income is $66,072 (ACS 2020-2024), the 6th highest of the 6 ranked ZIP codes in Cerro Gordo County. It is not measurably different from 2015-2019 ($62,992 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $66,072
- Income per person
- $37,886
- Below the poverty line
- 11.4%
- Unemployed (of the labor force)
- 2.7%
- Adults 25+ with a bachelor's degree
- 21.4%
- Adjusted gross income per tax return, 2022
- $69,95413,150 returns; wages 67% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 50401?
FHFA's house price index for 50401, built from repeat sales and appraisals of the same homes, rose 58% from 2015 to 2025 and rose 39% from 2020 to 2025, and moved +1.8% in 2025.
- Median home value (owners' estimate)
- $146,500
- Median gross rent
- $875
- Homes owned by their occupants
- 66.3%
- Housing units
- 14,875
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 50401?
899 business establishments had a location in this ZIP code in 2023, 75 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade149
- Health care and social assistance104
- Other services (except public administration)93
- Accommodation and food services88
- Construction80
- Wholesale trade60
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 50401?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 50467 | Rock Falls | 63 | $64k | 7.7 mi |
| 50464 | Plymouth | 694 | $92k | 9.2 mi |
| 50458 | Nora Springs | 2,094 | $100k | 9.5 mi |
| 50456 | Manly | 1,699 | $81k | 9.5 mi |
| 50428 | Clear Lake | 9,071 | $81k | 9.7 mi |
| 50469 | Rockwell | 1,527 | $71k | 10.7 mi |
| 50444 | Hanlontown | 394 | $78k | 13.5 mi |
| 50468 | Rockford | 1,617 | $73k | 15.3 mi |
| 50477 | Swaledale | 250 | $52k | 13.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.
Which other ZIP codes use the name Mason City?
1 more ZIP code carries the postal name Mason City, IA without a residential delivery area: PO boxes at the post office, or a single organization with its own ZIP code. The Census Bureau publishes no figures for it.
| ZIP | County |
|---|---|
| 50402 | Cerro Gordo County |
Source: GeoNames postal codes (CC BY 4.0), downloaded 2026-10-09; a ZIP code with no Census ZCTA has no residential delivery area.