51566 ZIP Code — Red Oak, IA

Montgomery County, Iowa

ZIP code 51566 is located in Red Oak, Iowa, within Montgomery County. It covers approximately 176.40 square miles and serves a population of 6,764 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51566

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 $103,600. Owner-occupancy sits near the national average at 68%.

The gap between median ($57,603) and mean household income suggests income inequality — a small number of higher earners pull the average up. SNAP benefit usage at 17% of households reflects economic stress in the area. 42% 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 18 minutes is near the national average.

College attainment at 17% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 51566 reflects a community defined by a trades-oriented workforce, a significant Social Security-dependent population, and elevated reliance on food assistance.

6,764

population

176.40

sq mi land

Standard

ZIP type

Central (CT)

timezone

51566 ZIP code map

Cities in ZIP code 51566

Below are the cities the US Postal Service accepts for ZIP code 51566. Using any city not on this list may result in mail delivery delays.

City	Status
Red Oak	Preferred

Nearby ZIP codes

51573 Stanton (7.2 mi) 51533 Emerson (7.7 mi) 51532 Elliott (9.9 mi) 50864 Villisca (10.8 mi) 51638 Essex (12.8 mi) 51540 Hastings (14.6 mi) 51535 Griswold (15.7 mi) 51549 Macedonia (16.3 mi) 51525 Carson (16.5 mi) 51551 Malvern (19.2 mi) 51603 Shenandoah (19.5 mi)

Demographics updated 06/2026

Population
Total population	6,764
Population density	38 / sq mi
State FIPS	19
County FIPS	137

Geography
Land area	176.40 sq mi
Water area	0.57 sq mi
Latitude	41.0232
Longitude	-95.2184
Timezone	Central (CT)
Area code	712

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.6%	42.7%	40.1%
$50k – $100k	32.5%	34.3%	33.4%
$100k – $200k	17.9%	19.6%	21.5%
Over $200k	4.0%	3.4%	5.0%

Demographics & statistics

6,764

Population

People per sq mi

43.2

Median age

$57,603

Median household income

$38,149

Per capita income

$103,600

Median home value

$721

Median monthly rent

67.8%

Home ownership

15.9%

Poverty rate

6.4%

Unemployment

2,411

Housing units

17.4%

Bachelor's or higher

Age distribution

Male Female

162

Under 5

179

227

5–9

250

205

10–14

225

199

15–19

219

176

20–24

194

321

25–34

353

348

35–44

384

395

45–54

434

233

55–59

256

255

60–64

281

378

65–74

416

184

75–84

202

137

85+

151

← Male

Female →

Age summary

Group	Count	%
Under 18	1,485	22.0%
18 and over	5,279	78.0%
65 and over	1,468	21.7%
Median age	43.2 years

Race & ethnicity

White 90.9%

Two or more races 3.3%

American Indian / Alaska Native 2.5%

Hispanic or Latino 0.9%

Other race 0.8%

Black or African American 0.6%

Asian 0.6%

Native Hawaiian / Pacific Islander 0.4%

Group	Count	%
White	6,206	90.9%
Two or more races	226	3.3%
American Indian / Alaska Native	172	2.5%
Hispanic or Latino	60	0.9%
Other race	54	0.8%
Black or African American	42	0.6%
Asian	39	0.6%
Native Hawaiian / Pacific Islander	25	0.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.6%	42.7%	40.1%
$50k – $100k	32.5%	34.3%	33.4%
$100k – $200k	17.9%	19.6%	21.5%
Over $200k	4.0%	3.4%	5.0%

Under $10k 4.3%

$10k–$15k 7.5%

$15k–$25k 10.4%

$25k–$35k 9.0%

$35k–$50k 13.4%

$50k–$75k 17.6%

$75k–$100k 12.3%

$100k–$150k 14.7%

$150k–$200k 7.3%

$200k+ 3.6%

Range	% of households
Under $10k	4.3%
$10k–$15k	7.5%
$15k–$25k	10.4%
$25k–$35k	9.0%
$35k–$50k	13.4%
$50k–$75k	17.6%
$75k–$100k	12.3%
$100k–$150k	14.7%
$150k–$200k	7.3%
$200k+	3.6%
Median income	$57,603

Housing

Home values

Under $50k 12.1%

$50k–$100k 36.5%

$100k–$150k 16.1%

$150k–$200k 14.2%

$200k–$300k 11.4%

$300k–$500k 7.2%

$500k–$1M 2.2%

$1M+ 0.4%

Housing overview

Metric	Value
Median home value	$103,600
Median rent / month	$721
Owner occupied	67.8%
Renter occupied	32.2%
Vacant	11.1%
Single-family detached	80.8%
Large apartment buildings	2.4%
Mobile homes	2.6%
Median rooms	6.1
Avg household size (owned)	2.12

Year built

Era	%
2020 or later	0.0%
2010–2019	2.6%
2000–2009	5.7%
1990–1999	4.5%
1980–1989	5.6%
1970–1979	17.7%
1960–1969	8.5%
1950–1959	11.5%
1940–1949	9.4%
1939 or earlier	34.5%

Bedrooms

Size	% of units
No bedroom (studio)	0.1%
1 bedroom	6.7%
2 bedrooms	36.9%
3 bedrooms	31.9%
4 bedrooms	19.1%
5+ bedrooms	5.2%

Vehicles per household

Vehicles	% of households
No vehicle	5.8%
1 vehicle	37.5%
2 vehicles	30.0%
3 or more	26.8%

Heating fuel

Fuel type	%
Utility gas	57.1%
Electricity	25.2%
Propane / LP gas	14.9%
Fuel oil	0.3%
Wood	0.2%
No fuel used	1.6%

Households & families

Household type	Count	%
Married-couple family	1,250	41.6%
Cohabiting couple	314	10.5%
Male householder, no spouse	650	21.6%
Female householder, no spouse	790	26.3%
Households with children under 18	851	28.3%
Households with seniors (65+)	1,058	35.2%
Average household size	2.21

Marital status

Status	Male	Female
Never married	34.7%	23.5%
Married	49.8%	46.3%
Separated	0.7%	0.7%
Widowed	4.4%	13.7%
Divorced	10.4%	15.8%

Education

Less than 9th grade 2.0%

Some HS, no diploma 7.7%

HS graduate 37.8%

Some college, no degree 21.9%

Associate's degree 13.1%

Bachelor's degree 11.8%

Graduate / professional 5.6%

Metric	%
HS diploma or higher	90.3%
Bachelor's or higher	17.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	38	2.7%
Kindergarten	102	7.3%
Elementary school	735	52.3%
High school	391	27.8%
College / grad school	139	9.9%

Employment

Industry of employment

Education & healthcare 24.8%

Retail trade 17.7%

Manufacturing 16.8%

Agriculture & mining 7.7%

Construction 7.3%

Arts, food & hospitality 5.9%

Finance & real estate 3.7%

Wholesale trade 3.6%

Transportation & utilities 3.6%

Professional & management 2.9%

Public administration 2.9%

Other services 1.7%

Information 1.5%

Occupation

Category	%
Management, business & arts	26.9%
Service	15.3%
Sales & office	24.6%
Natural resources & construction	11.7%
Production & transportation	21.5%

Employment type

Type	%
Private sector	84.9%
Government	9.9%
Self-employed	5.2%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	84.4%
Carpool	6.5%
Public transit	0.4%
Walk	1.7%
Work from home	6.7%
Other means	0.3%
Avg commute (minutes)	18.4

Poverty

All people 15.9%

Under 18 years 22.0%

18 and over 14.2%

Married-couple families 2.5%

Female-led households 55.2%

Income support

Source	% of households
Social Security	41.9%
Retirement income	27.9%
Supplemental Security	5.0%
Cash public assistance	2.0%
Food stamps / SNAP	17.4%

Health indicators

Condition	%
Obesity	42.0%
High blood pressure	38.4%
High cholesterol	35.4%
Diabetes	12.2%
Heart disease	8.4%
Stroke	3.9%
Asthma	9.7%
Arthritis	29.4%
Kidney disease	3.6%
Pulmonary disease	8.8%
Cancer	8.3%

Behavior / access	%
Smoking	20.0%
Binge drinking	20.0%
No physical activity	28.7%
Less than 7 hrs sleep	30.6%
Depression	18.1%
Fair or poor health	16.3%
Poor mental health	13.8%
Poor physical health	11.7%
No health insurance	10.4%
Visited doctor (checkup)	76.7%
Visited dentist	62.3%
Cholesterol screening	88.9%
Teeth loss	16.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	451	8.5%

Disability	%
Any disability	18.1%
Under 18	12.8%
18–64 years	14.1%
65 and over	34.7%

Health insurance coverage

Type	%
Private insurance	62.6%
Public insurance	51.9%
No insurance	2.4%
Uninsured under 19	0.6%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	6,423	95.0%
Spanish	22	0.3%
Other Indo-European	18	0.3%
Asian & Pacific Islander	4	0.1%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	6,728	99.5%
Born in same state	6,698	99.0%
Born in different state	4,710	69.6%
Foreign born	30	0.4%
Naturalized citizen	36	0.5%
Not a US citizen	36	100.0%

Ancestry

Ancestry	Count	%
French	1,007	14.9%
Italian	572	8.5%
Arab	322	4.8%
Polish	106	1.6%

Ancestry	Count	%
Dutch	67	1%
English	53	0.8%
Norwegian	19	0.3%
German	11	0.2%

Technology access

Metric	% of households
Computer access	44.4%
Internet access	87.8%

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

Frequently asked questions about ZIP code 51566

What city is ZIP code 51566 in?

ZIP code 51566 is primarily assigned to Red Oak, Iowa.

What county is ZIP code 51566 in?

ZIP code 51566 falls within Montgomery County, Iowa.

Does ZIP code 51566 have a large retiree population?

42% of households in ZIP code 51566 receive Social Security income, suggesting a significant retiree or disability population.

What is the poverty rate in ZIP code 51566?

16% of residents in ZIP code 51566 live below the poverty line, above the national average.

What is the typical home value in ZIP code 51566?

The median home value in ZIP code 51566 is $103,600.

What is the population of ZIP code 51566?

ZIP code 51566 has an estimated population of 6,764 residents, with a density of 38 people per square mile.

What timezone is ZIP code 51566 in?

ZIP code 51566 observes the CST timezone.