51535 ZIP Code — Griswold, IA

Cass County, Iowa

ZIP code 51535 is located in Griswold, Iowa, within Cass County. It covers approximately 135.33 square miles and serves a population of 1,730 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51535

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 $128,300. Owner-occupancy is high at 85%, well above the national average.

Median household income is $81,326. The poverty rate of 6% is below the national average. 44% 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 25 minutes is near the national average.

College attainment at 18% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 51535 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

1,730

population

135.33

sq mi land

Standard

ZIP type

Central (CT)

timezone

51535 ZIP code map

Cities in ZIP code 51535

Below are the cities the US Postal Service accepts for ZIP code 51535. Using any city not on this list may result in mail delivery delays.

City	Status
Griswold	Preferred

Nearby ZIP codes

51544 Lewis (5.2 mi) 51532 Elliott (6.4 mi) 50022 Atlantic (12.5 mi) 50843 Cumberland (12.8 mi) 51560 Oakland (14.7 mi) 51525 Carson (14.9 mi) 51566 Red Oak (15.7 mi) 51577 Walnut (15.8 mi) 51552 Marne (16.2 mi) 51536 Hancock (16.4 mi) 51549 Macedonia (17.2 mi) 50864 Villisca (17.2 mi)

Demographics updated 05/2026

Population
Total population	1,730
Population density	13 / sq mi
State FIPS	19
County FIPS	029

Geography
Land area	135.33 sq mi
Water area	0.01 sq mi
Latitude	41.2381
Longitude	-95.1180
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	35.4%	46.7%	40.1%
$50k – $100k	47.7%	34.2%	33.4%
$100k – $200k	13.3%	15.6%	21.5%
Over $200k	3.6%	3.6%	5.0%

Demographics & statistics

1,730

Population

People per sq mi

48.4

Median age

$81,326

Median household income

$43,514

Per capita income

$128,300

Median home value

$900

Median monthly rent

85.3%

Home ownership

6.0%

Poverty rate

1.2%

Unemployment

741

Housing units

18.1%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

147

45–54

123

55–59

100

60–64

117

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	397	22.9%
18 and over	1,333	77.1%
65 and over	422	24.4%
Median age	48.4 years

Race & ethnicity

White 93.6%

Two or more races 3.8%

Hispanic or Latino 1.4%

Other race 1.3%

Group	Count	%
White	1,642	93.6%
Two or more races	66	3.8%
Hispanic or Latino	25	1.4%
Other race	22	1.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	35.4%	46.7%	40.1%
$50k – $100k	47.7%	34.2%	33.4%
$100k – $200k	13.3%	15.6%	21.5%
Over $200k	3.6%	3.6%	5.0%

Under $10k 1.8%

$10k–$15k 1.8%

$15k–$25k 5.5%

$25k–$35k 8.6%

$35k–$50k 8.9%

$50k–$75k 17.9%

$75k–$100k 21.5%

$100k–$150k 14.1%

$150k–$200k 5.8%

$200k+ 14.0%

Range	% of households
Under $10k	1.8%
$10k–$15k	1.8%
$15k–$25k	5.5%
$25k–$35k	8.6%
$35k–$50k	8.9%
$50k–$75k	17.9%
$75k–$100k	21.5%
$100k–$150k	14.1%
$150k–$200k	5.8%
$200k+	14.0%
Median income	$81,326

Housing

Home values

Under $50k 5.7%

$50k–$100k 36.4%

$100k–$150k 18.0%

$150k–$200k 8.5%

$200k–$300k 9.3%

$300k–$500k 19.5%

$500k–$1M 2.3%

$1M+ 0.3%

Housing overview

Metric	Value
Median home value	$128,300
Median rent / month	$900
Owner occupied	85.3%
Renter occupied	14.7%
Vacant	14.9%
Single-family detached	93.5%
Large apartment buildings	0.0%
Mobile homes	0.8%
Median rooms	6.6
Avg household size (owned)	2.42

Year built

Era	%
2020 or later	0.0%
2010–2019	5.7%
2000–2009	3.7%
1990–1999	6.4%
1980–1989	5.8%
1970–1979	8.1%
1960–1969	5.3%
1950–1959	9.1%
1940–1949	4.1%
1939 or earlier	51.8%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	6.1%
2 bedrooms	25.1%
3 bedrooms	45.7%
4 bedrooms	20.7%
5+ bedrooms	1.9%

Vehicles per household

Vehicles	% of households
No vehicle	1.1%
1 vehicle	18.2%
2 vehicles	35.0%
3 or more	45.8%

Heating fuel

Fuel type	%
Utility gas	43.1%
Electricity	27.0%
Propane / LP gas	29.0%
No fuel used	0.4%

Households & families

Household type	Count	%
Married-couple family	412	57.1%
Cohabiting couple	47	6.5%
Male householder, no spouse	131	18.2%
Female householder, no spouse	131	18.2%
Households with children under 18	183	25.4%
Households with seniors (65+)	279	38.7%
Average household size	2.35

Marital status

Status	Male	Female
Never married	27.9%	18.4%
Married	56.5%	60.8%
Separated	1.2%	0.0%
Widowed	3.5%	14.0%
Divorced	11.0%	6.7%

Education

Less than 9th grade 2.9%

Some HS, no diploma 4.0%

HS graduate 35.9%

Some college, no degree 25.8%

Associate's degree 13.3%

Bachelor's degree 9.9%

Graduate / professional 8.2%

Metric	%
HS diploma or higher	93.1%
Bachelor's or higher	18.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	62	15.7%
Kindergarten	27	6.9%
Elementary school	135	34.3%
High school	113	28.7%
College / grad school	57	14.5%

Employment

Industry of employment

Education & healthcare 22.9%

Retail trade 13.4%

Agriculture & mining 12.9%

Transportation & utilities 9.7%

Construction 9.3%

Finance & real estate 6.4%

Manufacturing 6.3%

Professional & management 4.8%

Arts, food & hospitality 4.8%

Other services 4.0%

Wholesale trade 2.2%

Information 1.7%

Public administration 1.5%

Occupation

Category	%
Management, business & arts	33.4%
Service	14.9%
Sales & office	16.4%
Natural resources & construction	14.8%
Production & transportation	20.3%

Employment type

Type	%
Private sector	74.1%
Government	10.9%
Self-employed	14.9%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	73.5%
Carpool	9.1%
Public transit	0.0%
Walk	3.9%
Work from home	12.3%
Other means	1.3%
Avg commute (minutes)	25.0

Poverty

All people 6.0%

Under 18 years 11.9%

18 and over 4.2%

Married-couple families 1.0%

Female-led households 22.1%

Income support

Source	% of households
Social Security	43.6%
Retirement income	22.7%
Supplemental Security	2.8%
Cash public assistance	0.0%
Food stamps / SNAP	3.6%

Health indicators

Condition	%
Obesity	33.8%
High blood pressure	37.1%
High cholesterol	37.0%
Diabetes	11.0%
Heart disease	8.0%
Stroke	3.6%
Asthma	9.2%
Arthritis	28.3%
Kidney disease	3.3%
Pulmonary disease	7.7%
Cancer	8.4%

Behavior / access	%
Smoking	17.1%
Binge drinking	19.9%
No physical activity	26.2%
Less than 7 hrs sleep	31.0%
Depression	17.1%
Fair or poor health	13.7%
Poor mental health	12.8%
Poor physical health	10.3%
No health insurance	9.4%
Visited doctor (checkup)	74.5%
Visited dentist	63.4%
Cholesterol screening	89.9%
Teeth loss	13.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	123	9.2%

Disability	%
Any disability	7.4%
Under 18	0.0%
18–64 years	6.8%
65 and over	16.5%

Health insurance coverage

Type	%
Private insurance	75.2%
Public insurance	40.3%
No insurance	3.2%
Uninsured under 19	1.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,657	95.8%
Spanish	22	1.3%
Other Indo-European	13	0.8%
Asian & Pacific Islander	0	0.0%
Other languages	9	0.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,697	98.1%
Born in same state	1,697	98.1%
Born in different state	1,146	66.2%
Foreign born	0	0.0%
Naturalized citizen	33	1.9%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
French	275	15.9%
Italian	191	11%
Arab	127	7.3%
Dutch	117	6.8%

Ancestry	Count	%
Polish	37	2.1%
English	23	1.3%
German	1	0.1%

Technology access

Metric	% of households
Computer access	41.7%
Internet access	90.6%

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

Frequently asked questions about ZIP code 51535

What city is ZIP code 51535 in?

ZIP code 51535 is primarily assigned to Griswold, Iowa.

What county is ZIP code 51535 in?

ZIP code 51535 falls within Cass County, Iowa.

Is ZIP code 51535 mostly owner-occupied?

85% of occupied units in ZIP code 51535 are owner-occupied, well above the national average.

Does ZIP code 51535 have a large retiree population?

44% of households in ZIP code 51535 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 51535?

The median home value in ZIP code 51535 is $128,300.

Does ZIP code 51535 have a large veteran population?

9% of civilians in ZIP code 51535 are veterans, above the national average of ~7%.

What timezone is ZIP code 51535 in?

ZIP code 51535 observes the CST timezone.