Residential delivery area · Iowa
ZIP Code 51401: Carroll, IA
ZIP code 51401 uses the postal name Carroll, Iowa and lies entirely in Carroll County (Census 2020 ZIP-county file). About 12,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $70,702 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Carroll (3%) and Willey (under 1%); 96% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Carroll · its only residential ZIP
- County
- Carroll County
- Census places
- Carroll (3%); Willey (under 1%)
- Micro area
- Carroll, IA
- House district
- IA-4 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 168.6 sq mi · 71 people per sq mi
Where is ZIP code 51401?
51401 centers on 42.065°, -94.870° and covers 168.6 square miles of land plus 0.2 of water. It borders 11 ZIP codes: 51452, 51444, 51430, 51443, 51436, 51440, 51463, 51433, 51455, 51449 and more.
The map draws ZIP code areas only. For the streets inside 51401, 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 51401 compare with the rest of Carroll County?
| Measure | 51401 | In Carroll County | In IA |
|---|---|---|---|
| People (ACS 2020-2024) | 11,990 | 1st of 17 | 70th of 970 |
| Median household income | $71k | 6th of 7 | 265th of 396 |
| Median home value | $196k | 1st of 7 | 195th of 423 |
Its median household income is higher than in 48% of U.S. residential ZIP codes, and it is denser than 48% 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 51401?
The 2020 Census counted 12,248 people in 51401; the ACS, which samples households over 2020-2024, estimates 11,990. Between the 2010 and 2020 censuses its population fell 1.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 11,990
- 2020 Census count
- 12,248−1.0% since 2010 (12,373)
- Households
- 5,310
- Median age
- 43.0
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 51401?
Of the 11,990 people the ACS estimates in 51401, 22.8% are under 18 and 23.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (90.4%).
- Under 1822.8%
- 18 to 6454.0%
- 65 and older23.2%
- White, not Hispanic90.4%
- Hispanic or Latino4.4%
- Other or two or more4.3%
- Black, not Hispanic0.7%
- Asian, not Hispanic0.3%
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 51401 earn?
Median household income is $70,702 (ACS 2020-2024), the 6th highest of the 7 ranked ZIP codes in Carroll County. It is not measurably different from 2015-2019 ($71,122 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $70,702
- Income per person
- $41,907
- Below the poverty line
- 7.9%
- Unemployed (of the labor force)
- 2.1%
- Adults 25+ with a bachelor's degree
- 27.1%
- Adjusted gross income per tax return, 2022
- $93,9425,830 returns; wages 52% 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 51401?
FHFA's house price index for 51401, built from repeat sales and appraisals of the same homes, rose 58% from 2015 to 2025 and rose 34% from 2020 to 2025, and moved +1.7% in 2025.
- Median home value (owners' estimate)
- $195,700
- Median gross rent
- $726
- Homes owned by their occupants
- 73.7%
- Housing units
- 5,670
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 51401?
541 business establishments had a location in this ZIP code in 2023, 41 fewer than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance89
- Retail trade86
- Construction69
- Other services (except public administration)51
- Accommodation and food services44
- Finance and insurance35
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 51401?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51452 | Lidderdale | 177 | $61k | 5.9 mi |
| 51444 | Halbur | 290 | $83k | 6.4 mi |
| 51430 | Arcadia | 1,063 | $76k | 8.2 mi |
| 51443 | Glidden | 1,653 | $79k | 8.9 mi |
| 51436 | Breda | 815 | $62k | 11.0 mi |
| 51440 | Dedham | 334 | $88k | 11.0 mi |
| 51463 | Templeton | 412 | $79k | 11.1 mi |
| 51433 | Auburn | 567 | $68k | 13.9 mi |
| 51455 | Manning | 2,279 | $77k | 14.5 mi |
| 51449 | Lake City | 1,950 | $75k | 15.5 mi |
| 50058 | Coon Rapids | 1,999 | $80k | 17.1 mi |
| 51459 | Ralston | 54 | $63k | 12.0 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.