51010 ZIP Code — Castana, IA

Monona County, Iowa

ZIP code 51010 is located in Castana, Iowa, within Monona County. It covers approximately 72.03 square miles and serves a population of 411 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51010

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 $108,300. Owner-occupancy is high at 83%, well above the national average.

Median household income is $71,779. 45% 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. An above-average commute of 43 minutes suggests many residents work outside the immediate area.

College attainment at 7% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 51010 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

411

population

72.03

sq mi land

Standard

ZIP type

Central (CT)

timezone

51010 ZIP code map

Cities in ZIP code 51010

Below are the cities the US Postal Service accepts for ZIP code 51010. Using any city not on this list may result in mail delivery delays.

City	Status
Castana	Acceptable
Castana	Preferred

Nearby ZIP codes

51051 Rodney (6.4 mi) 51034 Mapleton (9 mi) 51056 Smithland (10.2 mi) 51572 Soldier (10.8 mi) 51040 Onawa (11.3 mi) 51063 Whiting (12 mi) 51060 Ute (12.1 mi) 51044 Oto (13 mi) 51026 Hornick (13.2 mi) 51558 Moorhead (13.2 mi) 51523 Blencoe (14.9 mi) 51019 Danbury (17 mi)

Demographics updated 05/2026

Population
Total population	411
Population density	6 / sq mi
State FIPS	19
County FIPS	133

Geography
Land area	72.03 sq mi
Water area	0.41 sq mi
Latitude	42.1005
Longitude	-95.9336
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	33.3%	47.2%	40.1%
$50k – $100k	41.4%	33.9%	33.4%
$100k – $200k	24.1%	16.1%	21.5%
Over $200k	1.1%	2.8%	5.0%

Demographics & statistics

411

Population

People per sq mi

60.0

Median age

$71,779

Median household income

$40,211

Per capita income

$108,300

Median home value

$714

Median monthly rent

82.6%

Home ownership

8.0%

Poverty rate

1.8%

Unemployment

209

Housing units

6.8%

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	53	12.9%
18 and over	358	87.1%
65 and over	114	27.7%
Median age	60.0 years

Race & ethnicity

White 98.5%

Two or more races 1.5%

Group	Count	%
White	405	98.5%
Two or more races	6	1.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	33.3%	47.2%	40.1%
$50k – $100k	41.4%	33.9%	33.4%
$100k – $200k	24.1%	16.1%	21.5%
Over $200k	1.1%	2.8%	5.0%

$10k–$15k 3.3%

$15k–$25k 10.3%

$25k–$35k 7.5%

$35k–$50k 8.5%

$50k–$75k 23.9%

$75k–$100k 14.6%

$100k–$150k 29.1%

$150k–$200k 2.3%

$200k+ 0.5%

Range	% of households
$10k–$15k	3.3%
$15k–$25k	10.3%
$25k–$35k	7.5%
$35k–$50k	8.5%
$50k–$75k	23.9%
$75k–$100k	14.6%
$100k–$150k	29.1%
$150k–$200k	2.3%
$200k+	0.5%
Median income	$71,779

Housing

Home values

Under $50k 18.2%

$50k–$100k 26.1%

$100k–$150k 25.6%

$150k–$200k 10.2%

$200k–$300k 11.4%

$300k–$500k 5.1%

$1M+ 3.4%

Housing overview

Metric	Value
Median home value	$108,300
Median rent / month	$714
Owner occupied	82.6%
Renter occupied	17.4%
Vacant	13.4%
Single-family detached	84.6%
Large apartment buildings	0.0%
Mobile homes	9.3%
Median rooms	7.3
Avg household size (owned)	2.03

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	22.8%
1990–1999	4.9%
1980–1989	8.5%
1970–1979	3.3%
1960–1969	9.8%
1950–1959	12.2%
1940–1949	3.7%
1939 or earlier	35.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	4.1%
2 bedrooms	42.3%
3 bedrooms	39.8%
4 bedrooms	11.8%
5+ bedrooms	2.0%

Vehicles per household

Vehicles	% of households
No vehicle	4.7%
1 vehicle	6.1%
2 vehicles	47.9%
3 or more	41.3%

Heating fuel

Fuel type	%
Utility gas	2.3%
Electricity	30.0%
Propane / LP gas	40.8%
Fuel oil	7.5%
Wood	11.7%
No fuel used	4.2%

Households & families

Household type	Count	%
Married-couple family	99	46.5%
Cohabiting couple	28	13.1%
Male householder, no spouse	47	22.1%
Female householder, no spouse	39	18.3%
Households with children under 18	36	16.9%
Households with seniors (65+)	85	39.9%
Average household size	1.93

Marital status

Status	Male	Female
Never married	8.6%	14.3%
Married	61.1%	51.5%
Separated	0.0%	0.0%
Widowed	4.6%	19.9%
Divorced	25.7%	14.3%

Education

Less than 9th grade 0.0%

Some HS, no diploma 2.9%

HS graduate 48.2%

Some college, no degree 30.0%

Associate's degree 12.1%

Bachelor's degree 6.8%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	97.1%
Bachelor's or higher	6.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	1	1.7%
Kindergarten	0	0.0%
Elementary school	30	51.7%
High school	16	27.6%
College / grad school	11	19.0%

Employment

Industry of employment

Education & healthcare 21.3%

Retail trade 14.2%

Manufacturing 12.7%

Transportation & utilities 12.4%

Arts, food & hospitality 9.7%

Construction 7.9%

Professional & management 7.5%

Finance & real estate 4.1%

Agriculture & mining 3.7%

Public administration 3.4%

Other services 1.5%

Wholesale trade 1.1%

Information 0.4%

Occupation

Category	%
Management, business & arts	27.3%
Service	25.8%
Sales & office	11.6%
Natural resources & construction	13.1%
Production & transportation	22.1%

Employment type

Type	%
Private sector	88.4%
Government	6.4%
Self-employed	5.2%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	88.8%
Carpool	3.4%
Public transit	1.9%
Walk	0.4%
Work from home	5.2%
Other means	0.4%
Avg commute (minutes)	42.5

Poverty

All people 8.0%

Under 18 years 11.3%

18 and over 7.5%

Married-couple families 3.0%

Female-led households 50.0%

Income support

Source	% of households
Social Security	44.6%
Retirement income	22.5%
Supplemental Security	0.0%
Cash public assistance	6.1%
Food stamps / SNAP	6.6%

Health indicators

Condition	%
Obesity	35.8%
High blood pressure	36.9%
High cholesterol	36.9%
Diabetes	11.4%
Heart disease	7.4%
Stroke	3.4%
Asthma	9.3%
Arthritis	27.2%
Kidney disease	3.1%
Pulmonary disease	7.9%
Cancer	7.6%

Behavior / access	%
Smoking	19.0%
Binge drinking	20.9%
No physical activity	25.0%
Less than 7 hrs sleep	30.8%
Depression	17.8%
Fair or poor health	13.9%
Poor mental health	13.4%
Poor physical health	10.6%
No health insurance	9.1%
Visited doctor (checkup)	75.5%
Visited dentist	64.6%
Cholesterol screening	89.4%
Teeth loss	13.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	29	8.1%

Disability	%
Any disability	8.8%
Under 18	0.0%
18–64 years	7.4%
65 and over	15.8%

Health insurance coverage

Type	%
Private insurance	74.5%
Public insurance	35.5%
No insurance	3.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	405	98.5%
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)	411	100.0%
Born in same state	411	100.0%
Born in different state	329	80.0%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
French	103	25.1%
Polish	64	15.6%
Italian	34	8.3%

Ancestry	Count	%
Dutch	24	5.8%
English	15	3.6%
Arab	4	1%

Technology access

Metric	% of households
Computer access	51.8%
Internet access	91.5%

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

Frequently asked questions about ZIP code 51010

What city is ZIP code 51010 in?

ZIP code 51010 is primarily assigned to Castana, Iowa.

What county is ZIP code 51010 in?

ZIP code 51010 falls within Monona County, Iowa.

Does ZIP code 51010 have an older population?

28% of residents in ZIP code 51010 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 51010?

7% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Does ZIP code 51010 have a large retiree population?

45% of households in ZIP code 51010 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 51010 mostly owner-occupied?

83% of occupied units in ZIP code 51010 are owner-occupied, well above the national average.

What timezone is ZIP code 51010 in?

ZIP code 51010 observes the CST timezone.