52231 ZIP Code — Harper, IA

Keokuk County, Iowa

ZIP code 52231 is located in Harper, Iowa, within Keokuk County. It covers approximately 34.53 square miles and serves a population of 439 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 641.

About ZIP code 52231

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $205,600. Owner-occupancy is high at 90%, well above the national average.

Median household income is $85,769. 40% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is natural resources, construction, and trades, with construction as the leading industry. The average commute of 19 minutes is near the national average.

Educational attainment is near the national average, with 21% of residents holding a bachelor's degree or higher.

Overall, ZIP code 52231 reflects a community defined by high homeownership and a significant Social Security-dependent population.

439
population
34.53
sq mi land
Standard
ZIP type
Central (CT)
timezone
52231 ZIP code map
Cities in ZIP code 52231

Below are the cities the US Postal Service accepts for ZIP code 52231. Using any city not on this list may result in mail delivery delays.

City Status
Harper Acceptable
Demographics updated 05/2026
Population
Total population 439
Population density 13 / sq mi
State FIPS 19
County FIPS 107
Geography
Land area 34.53 sq mi
Water area 0.04 sq mi
Latitude 41.3578
Longitude -92.0727
Timezone Central (CT)
Area code 641
Total population by age
Gender
Race & ethnicity
Economics updated 05/2026
Household income
Income range This ZIP County avg State avg
Under $50k 34.9% 45.3% 40.1%
$50k – $100k 37.2% 33.2% 33.4%
$100k – $200k 27.9% 18.6% 21.5%
Over $200k 0.0% 2.9% 5.0%

Demographics & statistics

439
Population
13
People per sq mi
39.6
Median age
$85,769
Median household income
$35,420
Per capita income
$205,600
Median home value
$731
Median monthly rent
89.7%
Home ownership
1.1%
Poverty rate
3.8%
Unemployment
140
Housing units
21.1%
Bachelor's or higher

Age distribution

Male Female
6
Under 5
5
21
5–9
15
41
10–14
30
29
15–19
20
3
20–24
3
8
25–34
6
30
35–44
21
47
45–54
33
9
60–64
6
52
65–74
38
6
75–84
4
3
85+
3
← Male
Female →

Age summary

GroupCount%
Under 1815134.4%
18 and over28865.6%
65 and over10624.1%
Median age39.6 years

Race & ethnicity

White 97.9%
Two or more races 1.4%
Black or African American 0.2%
Asian 0.2%
American Indian / Alaska Native 0.2%
GroupCount%
White43097.9%
Two or more races61.4%
Black or African American10.2%
Asian10.2%
American Indian / Alaska Native10.2%

Household income

Income range This ZIP County avg State avg
Under $50k 34.9% 45.3% 40.1%
$50k – $100k 37.2% 33.2% 33.4%
$100k – $200k 27.9% 18.6% 21.5%
Over $200k 0.0% 2.9% 5.0%
$10k–$15k 0.6%
$15k–$25k 17.9%
$35k–$50k 7.7%
$50k–$75k 21.2%
$75k–$100k 12.2%
$100k–$150k 35.3%
$200k+ 5.1%
Range% of households
$10k–$15k0.6%
$15k–$25k17.9%
$35k–$50k7.7%
$50k–$75k21.2%
$75k–$100k12.2%
$100k–$150k35.3%
$200k+5.1%
Median income$85,769

Housing

Home values

Under $50k 10.0%
$50k–$100k 19.3%
$100k–$150k 9.3%
$150k–$200k 10.7%
$200k–$300k 13.6%
$300k–$500k 29.3%
$500k–$1M 7.9%

Housing overview

MetricValue
Median home value$205,600
Median rent / month$731
Owner occupied89.7%
Renter occupied10.3%
Vacant0.0%
Single-family detached100.0%
Large apartment buildings0.0%
Mobile homes0.0%
Median rooms6.8
Avg household size (owned)2.93

Year built

Era%
2020 or later1.9%
2010–20198.3%
2000–20094.5%
1990–199919.2%
1980–19895.1%
1970–19791.9%
1960–196918.6%
1950–19591.3%
1940–19491.9%
1939 or earlier37.2%

Bedrooms

Size% of units
No bedroom (studio)0.0%
1 bedroom9.6%
2 bedrooms12.2%
3 bedrooms30.8%
4 bedrooms42.9%
5+ bedrooms4.5%

Vehicles per household

Vehicles% of households
No vehicle0.0%
1 vehicle17.3%
2 vehicles41.7%
3 or more41.0%

Heating fuel

Fuel type%
Utility gas16.0%
Electricity10.3%
Propane / LP gas65.4%
Fuel oil7.1%
Wood1.3%

Households & families

Household typeCount%
Married-couple family10466.7%
Cohabiting couple74.5%
Male householder, no spouse3623.1%
Female householder, no spouse95.8%
Households with children under 186139.1%
Households with seniors (65+)6340.4%
Average household size2.81

Marital status

StatusMaleFemale
Never married34.2%10.2%
Married54.4%78.9%
Separated0.0%0.0%
Widowed6.7%3.1%
Divorced4.7%7.8%

Education

Less than 9th grade 0.8%
Some HS, no diploma 2.3%
HS graduate 25.2%
Some college, no degree 43.2%
Associate's degree 7.5%
Bachelor's degree 7.5%
Graduate / professional 13.5%
Metric%
HS diploma or higher97.0%
Bachelor's or higher21.1%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool118.0%
Kindergarten1410.2%
Elementary school7655.5%
High school3424.8%
College / grad school21.5%

Employment

Industry of employment

Construction 38.0%
Education & healthcare 27.9%
Manufacturing 10.1%
Retail trade 10.1%
Agriculture & mining 4.5%
Finance & real estate 2.8%
Arts, food & hospitality 2.8%
Other services 1.7%
Professional & management 1.1%
Wholesale trade 0.6%
Public administration 0.6%

Occupation

Category%
Management, business & arts25.7%
Service10.6%
Sales & office16.8%
Natural resources & construction37.4%
Production & transportation9.5%

Employment type

Type%
Private sector67.6%
Government25.7%
Self-employed6.7%
Unpaid family workers0.0%

Commute

Method%
Drive alone76.8%
Carpool5.6%
Public transit0.0%
Walk9.6%
Work from home8.0%
Other means0.0%
Avg commute (minutes)18.6

Poverty

All people 1.1%
Under 18 years 1.3%
18 and over 1.0%
Married-couple families 0.0%
Female-led households 16.7%

Income support

Source% of households
Social Security40.4%
Retirement income27.6%
Supplemental Security9.6%
Cash public assistance0.0%
Food stamps / SNAP7.1%

Health indicators

Condition%
Obesity36.6%
High blood pressure34.7%
High cholesterol33.7%
Diabetes9.8%
Heart disease7.1%
Stroke3.2%
Asthma9.2%
Arthritis25.6%
Kidney disease3.0%
Pulmonary disease6.8%
Cancer7.5%
Behavior / access%
Smoking16.1%
Binge drinking22.0%
No physical activity24.9%
Less than 7 hrs sleep30.7%
Depression17.4%
Fair or poor health12.5%
Poor mental health13.0%
Poor physical health9.5%
No health insurance9.3%
Visited doctor (checkup)75.5%
Visited dentist67.4%
Cholesterol screening88.3%
Teeth loss12.9%

Veterans & disability

VeteransCount%
Civilian veterans175.9%
Disability%
Any disability9.1%
Under 180.0%
18–64 years0.5%
65 and over36.8%

Health insurance coverage

Type%
Private insurance64.2%
Public insurance45.3%
No insurance0.5%
Uninsured under 190.0%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only42897.5%
Spanish00.0%
Other Indo-European00.0%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)43899.8%
Born in same state43899.8%
Born in different state30970.4%
Foreign born00.0%
Naturalized citizen10.2%
Not a US citizen1100.0%

Ancestry

AncestryCount%
French11426%
Dutch286.4%
Arab265.9%
AncestryCount%
Italian255.7%
Polish81.8%
English61.4%

Technology access

Metric% of households
Computer access35.5%
Internet access82.1%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 52231

What city is ZIP code 52231 in?

ZIP code 52231 is primarily assigned to Harper, Iowa.

What county is ZIP code 52231 in?

ZIP code 52231 falls within Keokuk County, Iowa.

Is ZIP code 52231 family-oriented?

34% of residents in ZIP code 52231 are under 18, reflecting a younger, family-oriented community.

Is ZIP code 52231 mostly owner-occupied?

90% of occupied units in ZIP code 52231 are owner-occupied, well above the national average.

Does ZIP code 52231 have a large retiree population?

40% of households in ZIP code 52231 receive Social Security income, suggesting a significant retiree or disability population.

What is the population of ZIP code 52231?

ZIP code 52231 has an estimated population of 439 residents, with a density of 13 people per square mile.

What timezone is ZIP code 52231 in?

ZIP code 52231 observes the CST timezone.

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