Residential delivery area · Iowa
ZIP Code 51235: Doon, IA
ZIP code 51235 uses the postal name Doon, Iowa and lies mostly in Lyon County (97% of its land) with the rest in Sioux County (Census 2020 ZIP-county file). About 1,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $71,016 (Census Bureau, ACS 2020-2024). By Census place, 1% of its land lies in Doon; 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2021
- ZBP2023
- IRS2022
- Town
- Doon · its only residential ZIP
- County
- Lyon County (97%); Sioux County (3%)
- Census places
- Doon
- House district
- IA-4 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 53.5 sq mi · 19 people per sq mi
Where is ZIP code 51235?
51235 centers on 43.295°, -96.215° and covers 53.5 square miles of land. It borders 6 ZIP codes: 51230, 51239, 51247, 51246, 51237, 51240.
The map draws ZIP code areas only. For the streets inside 51235, 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 51235 compare with the rest of Lyon County?
| Measure | 51235 | In Lyon County | In IA |
|---|---|---|---|
| People (ACS 2020-2024) | 1,007 | 8th of 12 | 463rd of 970 |
| Median household income | $71k | 5th of 7 | 260th of 396 |
| Median home value | $241k | 4th of 8 | 109th of 423 |
Its median household income is higher than in 48% of U.S. residential ZIP codes, and it is denser than 25% 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 51235?
The 2020 Census counted 1,122 people in 51235; the ACS, which samples households over 2020-2024, estimates 1,007. Between the 2010 and 2020 censuses its population grew 4.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 1,007±198 (90% margin)
- 2020 Census count
- 1,122+4.0% since 2010 (1,079)
- Households
- 411
- Median age
- 37.1
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 51235?
Of the 1,007 people the ACS estimates in 51235, 25.2% are under 18 and 13.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (99.7%).
- Under 1825.2%
- 18 to 6460.9%
- 65 and older13.9%
- White, not Hispanic99.7%
- Other or two or more0.2%
- Hispanic or Latino0.1%
- Black, not Hispanic0.0%
- Asian, not Hispanic0.0%
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 51235 earn?
Median household income is $71,016 (ACS 2020-2024), the 5th highest of the 7 ranked ZIP codes in Lyon County. It is not measurably different from 2015-2019 ($95,705 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $71,016±$14,039
- Income per person
- $40,773
- Below the poverty line
- 9.8%
- Unemployed (of the labor force)
- 9.3%
- Adults 25+ with a bachelor's degree
- 7.6%
- Adjusted gross income per tax return, 2022
- $86,747470 returns; wages 57% 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 51235?
- Median home value (owners' estimate)
- $240,700
- Median gross rent
- $531
- Homes owned by their occupants
- 74.2%
- Housing units
- 411
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 51235?
44 business establishments had a location in this ZIP code in 2023, 7 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction9
- Other services (except public administration)8
- Transportation and warehousing7
- Retail trade5
- Manufacturing4
- Wholesale trade4
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 51235?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51230 | Alvord | 478 | $76k | 6.8 mi |
| 51239 | Hull | 2,876 | $78k | 7.2 mi |
| 51247 | Rock Valley | 5,094 | $78k | 9.3 mi |
| 51246 | Rock Rapids | 4,041 | $72k | 9.6 mi |
| 51237 | George | 1,605 | $62k | 11.2 mi |
| 51240 | Inwood | 1,914 | $84k | 12.3 mi |
| 51242 | Lester | 379 | $96k | 11.3 mi (near) |
| 51234 | Boyden | 1,172 | $84k | 12.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.