52321 ZIP Code — Onslow, IA

Jones County, Iowa

ZIP code 52321 is located in Onslow, Iowa, within Jones County. It covers approximately 37.55 square miles and serves a population of 458 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 563.

About ZIP code 52321

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 $110,200. Owner-occupancy is high at 81%, well above the national average.

Median household income is $58,750. Poverty affects 30% of residents, above the national average. SNAP benefit usage at 20% of households reflects economic stress in the area. 32% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with agriculture and mining as the leading industry. The average commute of 27 minutes is near the national average. Remote work is prevalent — 33% of workers work from home.

College attainment at 11% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 52321 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, high homeownership, a high rate of remote workers, a significant Social Security-dependent population, and elevated reliance on food assistance.

458
population
37.55
sq mi land
Standard
ZIP type
Central (CT)
timezone
52321 ZIP code map
Cities in ZIP code 52321

Below are the cities the US Postal Service accepts for ZIP code 52321. Using any city not on this list may result in mail delivery delays.

City Status
Onslow Preferred
Nearby ZIP codes
52309 Monmouth (4.8 mi) 52362 Wyoming (6.1 mi) 52212 Center Junction (6.5 mi) 52207 Baldwin (7.6 mi) 52033 Cascade (9.6 mi) 52323 Oxford Junction (11.2 mi) 52032 Bernard (11.8 mi) 52310 Monticello (12.6 mi) 52320 Olin (13 mi) 52060 Maquoketa (15.1 mi) 52254 Lost Nation (15.1 mi) 52079 Zwingle (15.9 mi)
Demographics updated 05/2026
Population
Total population 458
Population density 12 / sq mi
State FIPS 19
County FIPS 105
Geography
Land area 37.55 sq mi
Water area 0.00 sq mi
Latitude 42.1411
Longitude -90.9665
Timezone Central (CT)
Area code 563
Total population by age
Gender
Race & ethnicity
Economics updated 05/2026
Household income
Income range This ZIP County avg State avg
Under $50k 58.7% 43.4% 40.1%
$50k – $100k 28.4% 35.7% 33.4%
$100k – $200k 12.9% 16.9% 21.5%
Over $200k 0.0% 4.0% 5.0%

Demographics & statistics

458
Population
12
People per sq mi
39.5
Median age
$58,750
Median household income
$27,872
Per capita income
$110,200
Median home value
$766
Median monthly rent
80.7%
Home ownership
30.1%
Poverty rate
0.9%
Unemployment
170
Housing units
10.9%
Bachelor's or higher

Age distribution

Male Female
6
Under 5
4
25
5–9
19
21
10–14
16
23
15–19
17
14
20–24
10
19
25–34
15
41
35–44
31
16
45–54
12
17
55–59
12
7
60–64
6
48
65–74
36
21
75–84
16
3
85+
3
← Male
Female →

Age summary

GroupCount%
Under 1812126.4%
18 and over33773.6%
65 and over12727.7%
Median age39.5 years

Race & ethnicity

White 91.8%
Black or African American 5.2%
American Indian / Alaska Native 1.7%
Hispanic or Latino 0.7%
Two or more races 0.7%
GroupCount%
White42391.8%
Black or African American245.2%
American Indian / Alaska Native81.7%
Hispanic or Latino30.7%
Two or more races30.7%

Household income

Income range This ZIP County avg State avg
Under $50k 58.7% 43.4% 40.1%
$50k – $100k 28.4% 35.7% 33.4%
$100k – $200k 12.9% 16.9% 21.5%
Over $200k 0.0% 4.0% 5.0%
Under $10k 5.8%
$10k–$15k 2.3%
$15k–$25k 19.3%
$25k–$35k 3.5%
$35k–$50k 17.5%
$50k–$75k 6.4%
$75k–$100k 12.9%
$100k–$150k 26.9%
$150k–$200k 5.3%
Range% of households
Under $10k5.8%
$10k–$15k2.3%
$15k–$25k19.3%
$25k–$35k3.5%
$35k–$50k17.5%
$50k–$75k6.4%
$75k–$100k12.9%
$100k–$150k26.9%
$150k–$200k5.3%
Median income$58,750

Housing

Home values

Under $50k 4.3%
$50k–$100k 39.1%
$100k–$150k 19.6%
$150k–$200k 5.1%
$200k–$300k 10.9%
$300k–$500k 21.0%

Housing overview

MetricValue
Median home value$110,200
Median rent / month$766
Owner occupied80.7%
Renter occupied19.3%
Vacant15.8%
Single-family detached94.6%
Large apartment buildings0.0%
Mobile homes2.5%
Median rooms7.3
Avg household size (owned)2.68

Year built

Era%
2020 or later0.0%
2010–20190.0%
2000–20094.9%
1990–19997.4%
1980–19890.5%
1970–197916.3%
1960–19692.0%
1950–19599.4%
1940–19494.4%
1939 or earlier55.2%

Bedrooms

Size% of units
No bedroom (studio)0.0%
1 bedroom4.9%
2 bedrooms16.3%
3 bedrooms43.3%
4 bedrooms21.7%
5+ bedrooms13.8%

Vehicles per household

Vehicles% of households
No vehicle4.1%
1 vehicle19.3%
2 vehicles49.7%
3 or more26.9%

Heating fuel

Fuel type%
Utility gas8.2%
Electricity8.8%
Propane / LP gas64.3%
Wood18.7%

Households & families

Household typeCount%
Married-couple family6336.8%
Cohabiting couple2011.7%
Male householder, no spouse4828.1%
Female householder, no spouse4023.4%
Households with children under 186135.7%
Households with seniors (65+)7141.5%
Average household size2.68

Marital status

StatusMaleFemale
Never married54.3%34.2%
Married30.8%41.8%
Separated0.0%4.1%
Widowed5.0%2.7%
Divorced10.0%17.1%

Education

Less than 9th grade 1.3%
Some HS, no diploma 3.6%
HS graduate 41.6%
Some college, no degree 30.4%
Associate's degree 12.2%
Bachelor's degree 9.6%
Graduate / professional 1.3%
Metric%
HS diploma or higher95.0%
Bachelor's or higher10.9%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool1511.9%
Kindergarten64.8%
Elementary school6551.6%
High school3326.2%
College / grad school75.6%

Employment

Industry of employment

Agriculture & mining 30.0%
Education & healthcare 14.6%
Finance & real estate 12.9%
Manufacturing 9.9%
Retail trade 9.4%
Construction 8.2%
Public administration 4.3%
Transportation & utilities 3.0%
Wholesale trade 2.1%
Information 2.1%
Arts, food & hospitality 1.3%
Other services 1.3%
Professional & management 0.9%

Occupation

Category%
Management, business & arts53.6%
Service7.3%
Sales & office20.2%
Natural resources & construction2.6%
Production & transportation16.3%

Employment type

Type%
Private sector80.3%
Government9.0%
Self-employed10.7%
Unpaid family workers0.0%

Commute

Method%
Drive alone52.7%
Carpool11.3%
Public transit0.0%
Walk2.3%
Work from home33.3%
Other means0.5%
Avg commute (minutes)26.6

Poverty

All people 30.1%
Under 18 years 59.1%
18 and over 20.2%
Married-couple families 3.2%
Female-led households 60.0%

Income support

Source% of households
Social Security31.6%
Retirement income7.0%
Supplemental Security8.8%
Cash public assistance2.9%
Food stamps / SNAP19.9%

Health indicators

Condition%
Obesity37.3%
High blood pressure35.2%
High cholesterol34.2%
Diabetes10.8%
Heart disease7.3%
Stroke3.3%
Asthma9.2%
Arthritis25.7%
Kidney disease3.0%
Pulmonary disease7.2%
Cancer7.4%
Behavior / access%
Smoking18.5%
Binge drinking20.3%
No physical activity25.0%
Less than 7 hrs sleep30.2%
Depression17.5%
Fair or poor health13.1%
Poor mental health13.1%
Poor physical health10.1%
No health insurance9.4%
Visited doctor (checkup)75.0%
Visited dentist69.2%
Cholesterol screening89.3%
Teeth loss13.2%

Veterans & disability

VeteransCount%
Civilian veterans205.9%
Disability%
Any disability16.4%
Under 1812.4%
18–64 years24.3%
65 and over7.1%

Health insurance coverage

Type%
Private insurance61.4%
Public insurance60.5%
No insurance5.2%
Uninsured under 196.5%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only44897.8%
Spanish00.0%
Other Indo-European00.0%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)45699.6%
Born in same state44897.8%
Born in different state39085.2%
Foreign born81.7%
Naturalized citizen20.4%
Not a US citizen00.0%

Ancestry

AncestryCount%
Italian10322.5%
French347.4%
English143.1%
AncestryCount%
Arab112.4%
Polish71.5%
Dutch40.9%

Technology access

Metric% of households
Computer access37.3%
Internet access78.4%

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

Frequently asked questions about ZIP code 52321

What city is ZIP code 52321 in?

ZIP code 52321 is primarily assigned to Onslow, Iowa.

What county is ZIP code 52321 in?

ZIP code 52321 falls within Jones County, Iowa.

What is the poverty rate in ZIP code 52321?

30% of residents in ZIP code 52321 live below the poverty line, above the national average.

Does ZIP code 52321 have an older population?

28% of residents in ZIP code 52321 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 52321?

11% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Is ZIP code 52321 mostly owner-occupied?

81% of occupied units in ZIP code 52321 are owner-occupied, well above the national average.

What timezone is ZIP code 52321 in?

ZIP code 52321 observes the CST timezone.

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