Onslow ZIP Codes — Jones County, IA

There is one unique ZIP code in Onslow, Iowa and it is 52321. Area code: 563.

ZIP codes

37.55

sq mi land

0.00

sq mi water

563

area code

Onslow, IA ZIP code map

About Onslow, IA

Onslow is a small city located in Jones County, Iowa. Known for its rural charm and close-knit community, it provides a serene environment for residents and visitors alike. The city’s quaint atmosphere is enhanced by its historical significance and agricultural roots.

Location & geography

Onslow is situated in the northeastern part of Iowa, roughly 28 miles from Cedar Rapids and 20 miles from Dubuque. The city covers a total land area of 37.55 square miles, with no significant water bodies within its boundaries. This primarily flat terrain is conducive to the agricultural activities that define the region.

Community & economy

The character of Onslow is rooted in its agricultural heritage, with many residents engaged in farming and related industries. Daily life in Onslow reflects a sense of community, with local gatherings and events that strengthen social ties among residents. It is a tranquil place where neighbors know each other, making it a quintessential small-town experience.

Transportation

Onslow is accessible via local roadways; however, there are no major highways running directly through the city. The nearest named airports include the Eastern Iowa Airport in Cedar Rapids and the Dubuque Regional Airport. Public transportation options are limited in this rural area, emphasizing the importance of personal vehicles for commuting.

History

Onslow was established in the late 19th century, and its history is closely tied to the agricultural development of Jones County. The city's economy has historically revolved around farming, and it has retained its rural character over the years. Significant events in Onslow's history include community gatherings and agricultural fairs that celebrate its heritage.

Did you know?

A surprising fact about Onslow is that it has only one ZIP code, which is 52321, reflecting its small size. The city’s population density and community spirit contribute to a unique, tight-knit atmosphere that enhances the quality of life for residents.

ZIP codes for Onslow, IA (1)

ZIP code	City	County	Map
52321	Onslow	Jones	View map

Demographics & statistics

458

Population

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

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	121	26.4%
18 and over	337	73.6%
65 and over	127	27.7%
Median age	39.5 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%

Group	Count	%
White	423	91.8%
Black or African American	24	5.2%
American Indian / Alaska Native	8	1.7%
Hispanic or Latino	3	0.7%
Two or more races	3	0.7%

Household income

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 $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%
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

Metric	Value
Median home value	$110,200
Median rent / month	$766
Owner occupied	80.7%
Renter occupied	19.3%
Vacant	15.8%
Single-family detached	94.6%
Large apartment buildings	0.0%
Mobile homes	2.5%
Median rooms	7.3
Avg household size (owned)	2.68

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	4.9%
1990–1999	7.4%
1980–1989	0.5%
1970–1979	16.3%
1960–1969	2.0%
1950–1959	9.4%
1940–1949	4.4%
1939 or earlier	55.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	4.9%
2 bedrooms	16.3%
3 bedrooms	43.3%
4 bedrooms	21.7%
5+ bedrooms	13.8%

Vehicles per household

Vehicles	% of households
No vehicle	4.1%
1 vehicle	19.3%
2 vehicles	49.7%
3 or more	26.9%

Heating fuel

Fuel type	%
Utility gas	8.2%
Electricity	8.8%
Propane / LP gas	64.3%
Wood	18.7%

Households & families

Household type	Count	%
Married-couple family	63	36.8%
Cohabiting couple	20	11.7%
Male householder, no spouse	48	28.1%
Female householder, no spouse	40	23.4%
Households with children under 18	61	35.7%
Households with seniors (65+)	71	41.5%
Average household size	2.68

Marital status

Status	Male	Female
Never married	54.3%	34.2%
Married	30.8%	41.8%
Separated	0.0%	4.1%
Widowed	5.0%	2.7%
Divorced	10.0%	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 higher	95.0%
Bachelor's or higher	10.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	15	11.9%
Kindergarten	6	4.8%
Elementary school	65	51.6%
High school	33	26.2%
College / grad school	7	5.6%

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 & arts	53.6%
Service	7.3%
Sales & office	20.2%
Natural resources & construction	2.6%
Production & transportation	16.3%

Employment type

Type	%
Private sector	80.3%
Government	9.0%
Self-employed	10.7%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	52.7%
Carpool	11.3%
Public transit	0.0%
Walk	2.3%
Other means	0.5%
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 Security	31.6%
Retirement income	7.0%
Supplemental Security	8.8%
Cash public assistance	2.9%
Food stamps / SNAP	19.9%

Health indicators

Condition	%
High blood pressure	35.2%
High cholesterol	34.2%
Heart disease	7.3%
Stroke	3.3%
Asthma	9.2%
Arthritis	25.7%
Kidney disease	3.0%
Pulmonary disease	7.2%
Cancer	7.4%

Behavior / access	%
Binge drinking	20.3%
No physical activity	25.0%
Less than 7 hrs sleep	30.2%
Fair or poor health	13.1%
Poor mental health	13.1%
Poor physical health	10.1%
No health insurance	9.4%
Visited doctor (checkup)	75.0%
Visited dentist	69.2%
Cholesterol screening	89.3%
Teeth loss	13.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	20	5.9%

Disability	%
Any disability	16.4%
Under 18	12.4%
18–64 years	24.3%
65 and over	7.1%

Health insurance coverage

Type	%
Private insurance	61.4%
Public insurance	60.5%
Uninsured under 19	6.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	448	97.8%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	456	99.6%
Born in same state	448	97.8%
Born in different state	390	85.2%
Foreign born	8	1.7%
Naturalized citizen	2	0.4%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	103	22.5%
French	34	7.4%
English	14	3.1%

Ancestry	Count	%
Arab	11	2.4%
Polish	7	1.5%
Dutch	4	0.9%

Technology access

Metric	% of households
Computer access	37.3%
Internet access	78.4%

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

Frequently asked questions

What ZIP codes does Onslow, IA have?

Onslow, IA has one ZIP code: 52321. Each ZIP code serves a distinct delivery area within the city and surrounding region.