51331 ZIP Code — Arnolds Park, IA

Dickinson County, Iowa

ZIP code 51331 is located in Arnolds Park, Iowa, within Dickinson County. It covers approximately 1.61 square miles and serves a population of 1,017 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51331

The housing stock consists of a mix of housing types. Most homes were built in the 2000s, giving the area an established character. Median home value is $316,700. Owner-occupancy is high at 86%, well above the national average.

Median household income is $80,577. The poverty rate of 6% is below the national average. 51% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 17 minutes is near the national average.

Educational attainment is near the national average, with 39% of residents holding a bachelor's degree or higher.

Overall, ZIP code 51331 reflects a community defined by high homeownership and a significant Social Security-dependent population.

1,017

population

1.61

sq mi land

Standard

ZIP type

Central (CT)

timezone

51331 ZIP code map

Cities in ZIP code 51331

Below are the cities the US Postal Service accepts for ZIP code 51331. Using any city not on this list may result in mail delivery delays.

City	Status
Arnolds Park	Preferred

Nearby ZIP codes

51355 Okoboji (2.4 mi) 51360 Spirit Lake (4.6 mi) 51351 Milford (4.7 mi) 51364 Terril (9.2 mi) 51347 Lake Park (9.4 mi) 51301 Spencer (15.4 mi) 51338 Everly (15.4 mi) 51345 Harris (15.9 mi) 51333 Dickens (16.9 mi) 51334 Estherville (18.3 mi) 56150 Lakefield (19.2 mi) 51358 Ruthven (19.7 mi)

Demographics updated 05/2026

Population
Total population	1,017
Population density	632 / sq mi
State FIPS	19
County FIPS	059

Geography
Land area	1.61 sq mi
Water area	0.91 sq mi
Latitude	43.3592
Longitude	-95.1322
Timezone	Central (CT)
Area code	712

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	37.2%	39.9%	40.1%
$50k – $100k	33.2%	34.8%	33.4%
$100k – $200k	26.2%	19.6%	21.5%
Over $200k	3.4%	5.7%	5.0%

Demographics & statistics

1,017

Population

632

People per sq mi

61.6

Median age

$80,577

Median household income

$58,657

Per capita income

$316,700

Median home value

$658

Median monthly rent

85.5%

Home ownership

6.3%

Poverty rate

0.4%

Unemployment

1,552

Housing units

38.5%

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

115

65–74

136

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	71	7.0%
18 and over	946	93.0%
65 and over	373	36.7%
Median age	61.6 years

Race & ethnicity

White 98.4%

Two or more races 1.6%

Group	Count	%
White	1,001	98.4%
Two or more races	16	1.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	37.2%	39.9%	40.1%
$50k – $100k	33.2%	34.8%	33.4%
$100k – $200k	26.2%	19.6%	21.5%
Over $200k	3.4%	5.7%	5.0%

Under $10k 1.7%

$10k–$15k 3.4%

$15k–$25k 11.1%

$25k–$35k 4.1%

$35k–$50k 6.3%

$50k–$75k 18.5%

$75k–$100k 11.6%

$100k–$150k 25.3%

$150k–$200k 9.5%

$200k+ 8.5%

Range	% of households
Under $10k	1.7%
$10k–$15k	3.4%
$15k–$25k	11.1%
$25k–$35k	4.1%
$35k–$50k	6.3%
$50k–$75k	18.5%
$75k–$100k	11.6%
$100k–$150k	25.3%
$150k–$200k	9.5%
$200k+	8.5%
Median income	$80,577

Housing

Home values

Under $50k 4.8%

$50k–$100k 2.8%

$100k–$150k 8.5%

$150k–$200k 8.7%

$200k–$300k 23.7%

$300k–$500k 21.7%

$500k–$1M 19.9%

$1M+ 9.9%

Housing overview

Metric	Value
Median home value	$316,700
Median rent / month	$658
Owner occupied	85.5%
Renter occupied	14.5%
Vacant	64.1%
Single-family detached	60.4%
Large apartment buildings	9.6%
Mobile homes	13.8%
Median rooms	4.9
Avg household size (owned)	1.74

Year built

Era	%
2020 or later	0.0%
2010–2019	16.7%
2000–2009	24.6%
1990–1999	10.0%
1980–1989	5.3%
1970–1979	14.6%
1960–1969	3.5%
1950–1959	4.4%
1940–1949	4.6%
1939 or earlier	16.4%

Bedrooms

Size	% of units
No bedroom (studio)	2.4%
1 bedroom	8.1%
2 bedrooms	30.7%
3 bedrooms	37.2%
4 bedrooms	17.8%
5+ bedrooms	3.7%

Vehicles per household

Vehicles	% of households
No vehicle	0.5%
1 vehicle	34.5%
2 vehicles	51.2%
3 or more	13.8%

Heating fuel

Fuel type	%
Utility gas	75.3%
Electricity	22.3%
Propane / LP gas	1.0%
Wood	1.0%

Households & families

Household type	Count	%
Married-couple family	290	49.3%
Cohabiting couple	32	5.4%
Male householder, no spouse	104	17.7%
Female householder, no spouse	162	27.6%
Households with children under 18	40	6.8%
Households with seniors (65+)	266	45.2%
Average household size	1.73

Marital status

Status	Male	Female
Never married	23.5%	17.2%
Married	64.2%	56.4%
Separated	0.0%	0.8%
Widowed	3.6%	10.6%
Divorced	8.7%	15.1%

Education

Less than 9th grade 0.6%

Some HS, no diploma 1.5%

HS graduate 24.4%

Some college, no degree 24.9%

Associate's degree 10.1%

Bachelor's degree 27.6%

Graduate / professional 10.9%

Metric	%
HS diploma or higher	97.8%
Bachelor's or higher	38.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	7	13.2%
Kindergarten	0	0.0%
Elementary school	14	26.4%
High school	12	22.6%
College / grad school	20	37.7%

Employment

Industry of employment

Education & healthcare 20.1%

Finance & real estate 14.8%

Retail trade 13.8%

Manufacturing 11.3%

Professional & management 9.2%

Construction 8.8%

Arts, food & hospitality 6.6%

Other services 5.7%

Wholesale trade 3.3%

Transportation & utilities 2.1%

Public administration 1.9%

Agriculture & mining 1.6%

Information 0.8%

Occupation

Category	%
Management, business & arts	43.7%
Service	16.6%
Sales & office	24.2%
Natural resources & construction	8.6%
Production & transportation	7.0%

Employment type

Type	%
Private sector	82.7%
Government	7.8%
Self-employed	9.6%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.7%
Carpool	11.3%
Public transit	0.0%
Walk	0.4%
Work from home	10.2%
Other means	0.4%
Avg commute (minutes)	16.6

Poverty

All people 6.3%

Under 18 years 0.0%

18 and over 6.8%

Married-couple families 2.4%

Female-led households 0.0%

Income support

Source	% of households
Social Security	51.4%
Retirement income	35.7%
Supplemental Security	0.9%
Cash public assistance	1.0%
Food stamps / SNAP	4.4%

Health indicators

Condition	%
Obesity	34.8%
High blood pressure	39.7%
High cholesterol	37.3%
Diabetes	11.5%
Heart disease	8.3%
Stroke	3.5%
Asthma	8.6%
Arthritis	29.8%
Kidney disease	3.4%
Pulmonary disease	7.1%
Cancer	9.9%

Behavior / access	%
Smoking	13.2%
Binge drinking	18.3%
No physical activity	21.6%
Less than 7 hrs sleep	26.3%
Depression	15.4%
Fair or poor health	11.6%
Poor mental health	10.7%
Poor physical health	9.2%
No health insurance	6.8%
Visited doctor (checkup)	79.0%
Visited dentist	72.9%
Cholesterol screening	92.7%
Teeth loss	9.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	96	10.1%

Disability	%
Any disability	16.2%
Under 18	4.2%
18–64 years	9.1%
65 and over	29.5%

Health insurance coverage

Type	%
Private insurance	71.0%
Public insurance	51.4%
No insurance	2.9%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	975	95.9%
Spanish	5	0.5%
Other Indo-European	3	0.3%
Asian & Pacific Islander	2	0.2%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,007	99.0%
Born in same state	984	96.8%
Born in different state	648	63.7%
Foreign born	23	2.3%
Naturalized citizen	10	1.0%
Not a US citizen	5	50.0%

Ancestry

Ancestry	Count	%
French	172	16.9%
Italian	163	16%
Polish	78	7.7%

Ancestry	Count	%
English	61	6%
Arab	35	3.4%
Dutch	33	3.2%

Technology access

Metric	% of households
Computer access	57.8%
Internet access	98.6%

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

Frequently asked questions about ZIP code 51331

What city is ZIP code 51331 in?

ZIP code 51331 is primarily assigned to Arnolds Park, Iowa.

What county is ZIP code 51331 in?

ZIP code 51331 falls within Dickinson County, Iowa.

Does ZIP code 51331 have an older population?

37% of residents in ZIP code 51331 are 65 or older, above the national average of ~17%.

Does ZIP code 51331 have a large retiree population?

51% of households in ZIP code 51331 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 51331 mostly owner-occupied?

86% of occupied units in ZIP code 51331 are owner-occupied, well above the national average.

Does ZIP code 51331 have a large veteran population?

10% of civilians in ZIP code 51331 are veterans, above the national average of ~7%.

What timezone is ZIP code 51331 in?

ZIP code 51331 observes the CST timezone.