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ZIP CODE TABULATION AREA

51231

Iowa · 562 residents · 24.2 sq mi
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ZIP 51231 is home to 562 people in O'Brien County. This skews young, with a median age of 15.1. Owners hold 94% of the housing stock. That is roughly 58% ahead of the O'Brien County median. The poverty rate is 29.7%, above the 12.5% national rate. 0% of residents were born outside the United States. Among the 8 ZIP codes in O'Brien County, 51231 ranks 1st by median household income.

$108,058
US average: $82,259
$22,575
US average: $44,673
$189,500
US average: $376,019
33.5%
US average: 35.6%
Land area
24.2 sq mi
Age, sex & households
Under 18
55.5%
Age 65+
5.9%
59.6%
40.4%
3.99 people
Race & ethnicity · 2024
2024
White, non-Hispanic96.1%(540)
Black0%(0)
Hispanic / Latino0.2%(1)
Asian0%(0)
Other3.7%(21)
9
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Housing
1.8
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
Within O'Brien County
Income rank vs other ZIPs
LOWEST1ST OF 8HIGHEST
Adjacent ZIPs
51009$58,750
51022$96,505
51046$84,125
51058$63,036
Frequently asked

How many people live in ZIP code 51231?

ZIP code 51231 has about 562 residents according to the 2024 American Community Survey.

What is the median household income in ZIP code 51231?

The typical household in ZIP code 51231 earns about $108,058 a year. Half of households make more than that, and half make less.

Is ZIP code 51231 expensive?

In ZIP code 51231, the median home is worth about $189,500.

How educated are people in ZIP code 51231?

About 33.5% of adults age 25 and over in ZIP code 51231 hold a bachelor's degree or higher.

What is the poverty rate in ZIP code 51231?

About 29.7% of people in ZIP code 51231 live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR · ZCTA · UPDATED 2024