PlainZIP

Harper, IA · standard

ZIP Code 52231

Keokuk County, Iowa - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

328
4/sq mi
$90,893
Median income
$242,400
Median home value
16.5%
Bachelor's or higher

The verdict

Harper pairs an above-median household income with above-median home values, in a rural, homeowner-dominated area.

Top 26%
household income, US ZIPs
Top 44%
home value, US ZIPs
4
people per sq mi
96%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 52231 against every reporting US ZIP.

ZIP code 52231 is a sparsely populated ZIP (a standard USPS delivery area) in Harper, Keokuk County, Iowa, home to just 328 residents across 84.1 square miles, a density of 4 people per square mile, in the Chicago time zone.

ZIP 52231 lands in the middle-income range, with a median household income of $90,893 (19% above the Iowa average), while per-capita income is $36,397. Local economic indicators show a 2.2% poverty rate alongside 2.8% unemployment. Median home value sits at $242,400 (38% above the state average), median rent at $1,125 a month, and owner-occupancy at 96.4%.

Educational attainment sits below the national norm: 16.5% of adults hold a bachelor's degree or higher, the median age is 39.3, and the average commute is -. To put 52231 in local context, 5 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in Keokuk County, for a geography-aware comparison.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 52231, Harper, IA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

328

Population

84.1

Area (sq mi)

4

People / sq mi

Chicago

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 52231?

39.3

Median Age

58.8%

Male

41.2%

Female

0.0%

Foreign-Born

White 90.5%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 9.5%
Hispanic or Latino 8.5%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$90,893

Median Household Income

+19% vs state

$36,397

Per Capita Income

2.2%

Poverty Rate

2.8%

Unemployment Rate

How ZIP 52231 ranks nationally

Harper, IA household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$90,893 Top 26% higher than 74% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). This entry sits in this band. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 42.7%
Bachelor's Degree or Higher 16.5%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

197

Total Housing Units

197

Occupied Units

0

Vacant Units

2.74

Avg Household Size

Occupancy Type

Owner 96.4%
Renter 3.6%

$242,400

Median Home Value

+38% vs state

$1,125

Median Rent

1962

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 6 business establishments in ZIP 52231, employing approximately 26 people with a combined annual payroll of $2,108,000.

6

Businesses

26

Employees

$2.1M

Annual Payroll

0

Industry Sectors

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 52231 vs 52335 →

ZIP 52231 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 52231 ranks #5 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 52231 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 52231 ranks the highest of 6 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
52335 South English, IA 709 6.9 mi
52248 Keota, IA 1,815 6.3 mi
52591 Sigourney, IA 3,028 7.6 mi
52576 Ollie, IA 568 10.7 mi
52355 Webster, IA 277 9.4 mi

More ZIP Codes in Keokuk County

52591 standard
Sigourney, IA
Pop: 3,028
52248 standard
Keota, IA
Pop: 1,815
52563 standard
Hedrick, IA
Pop: 1,583
50268 standard
What Cheer, IA
Pop: 993
52335 standard
South English, IA
Pop: 709
52550 standard
Delta, IA
Pop: 585

Related Areas

Keokuk County Harper, IA Iowa

Frequently Asked Questions

What county is ZIP code 52231 in? ▼
ZIP code 52231 (Harper) is located in Keokuk County, Iowa. Keokuk County contains multiple ZIP codes, see the full list at /counties/keokuk-ia.
What is the population of ZIP code 52231? ▼
ZIP code 52231 in Harper, IA has a population of 328 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 52231? ▼
The median household income in ZIP 52231 is $90,893, which is 19% above the national average of $76,288.
What is the average home value in ZIP 52231? ▼
The median home value in ZIP 52231 is $242,400, which is 13% below the national average of $278,155.
What is the demographic makeup of ZIP 52231? ▼
The largest racial group in ZIP 52231 is White at 90.5%. Hispanic or Latino residents make up 8.5% of the population.
How many businesses are in ZIP code 52231? ▼
ZIP code 52231 has 6 business establishments employing approximately 26 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 52231? ▼
In ZIP code 52231, 42.7% of residents aged 25+ have a high school diploma or higher, and 16.5% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 52231? ▼
In ZIP code 52231, approximately 96.4% of occupied housing units are owner-occupied and 3.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 52231? ▼
The poverty rate in ZIP code 52231 is 2.2% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.