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ZIP CODE TABULATION AREA

51231

Iowa · 562 residents · 24.208 sq mi
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ZIP 51231 is significantly wealthier than the US average, with a median household income of $108,058. Population has held roughly steady since 2024. Median home value is $189,500. At a median age of 15.1, residents skew younger than the country as a whole. The poverty rate of 29.7% is well above the national figure. Households here earn about 58% more than the O'Brien County median. Among the 8 ZIP codes in O'Brien County, 51231 ranks 1st by median household income.

$108,058
US average: $82,259
$189,500
US average: $376,019
33.5%
US average: 35.6%
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)
Diversity Score9.4%(53)
Housing
Commute & vehicles
Work & employment
People & community
Affordability & inequality
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