51433 ZIP Code — Auburn, IA

Sac County, Iowa

ZIP code 51433 is located in Auburn, Iowa, within Sac County. It covers approximately 56.80 square miles and serves a population of 606 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51433

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 $76,100. Owner-occupancy sits near the national average at 57%.

Median household income is $61,438. Poverty affects 18% of residents, above the national average.

The dominant occupation class is production, transportation, and material moving, with manufacturing as the leading industry. The average commute of 31 minutes is near the national average.

College attainment at 11% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 51433 reflects a community defined by a trades-oriented workforce and economic challenges above the national average.

606

population

56.80

sq mi land

Standard

ZIP type

Central (CT)

timezone

51433 ZIP code map

Cities in ZIP code 51433

Below are the cities the US Postal Service accepts for ZIP code 51433. Using any city not on this list may result in mail delivery delays.

City	Status
Auburn	Acceptable
Auburn	Preferred

Nearby ZIP codes

51450 Lake View (7.5 mi) 51449 Lake City (8.6 mi) 50561 Lytton (9.3 mi) 51466 Wall Lake (9.9 mi) 51436 Breda (10.9 mi) 50583 Sac City (12.1 mi) 50579 Rockwell City (14.5 mi) 51401 Carroll (15 mi) 50551 Jolley (15 mi) 51453 Lohrville (16.8 mi) 51458 Odebolt (17.8 mi) 51443 Glidden (18 mi)

Demographics updated 05/2026

Population
Total population	606
Population density	11 / sq mi
State FIPS	19
County FIPS	161

Geography
Land area	56.80 sq mi
Water area	0.40 sq mi
Latitude	42.2893
Longitude	-94.8885
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	53.0%	43.8%	40.1%
$50k – $100k	42.3%	35.1%	33.4%
$100k – $200k	4.3%	17.5%	21.5%
Over $200k	0.4%	3.6%	5.0%

Demographics & statistics

606

Population

People per sq mi

32.8

Median age

$61,438

Median household income

$27,317

Per capita income

$76,100

Median home value

$724

Median monthly rent

57.2%

Home ownership

17.7%

Poverty rate

0.8%

Unemployment

144

Housing units

11.0%

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	180	29.7%
18 and over	426	70.3%
65 and over	62	10.2%
Median age	32.8 years

Race & ethnicity

White 99.2%

Black or African American 0.5%

Two or more races 0.3%

Group	Count	%
White	601	99.2%
Black or African American	3	0.5%
Two or more races	2	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	53.0%	43.8%	40.1%
$50k – $100k	42.3%	35.1%	33.4%
$100k – $200k	4.3%	17.5%	21.5%
Over $200k	0.4%	3.6%	5.0%

Under $10k 1.9%

$10k–$15k 2.8%

$15k–$25k 3.7%

$25k–$35k 6.0%

$35k–$50k 24.7%

$50k–$75k 17.2%

$75k–$100k 27.4%

$100k–$150k 11.6%

$150k–$200k 2.3%

$200k+ 2.3%

Range	% of households
Under $10k	1.9%
$10k–$15k	2.8%
$15k–$25k	3.7%
$25k–$35k	6.0%
$35k–$50k	24.7%
$50k–$75k	17.2%
$75k–$100k	27.4%
$100k–$150k	11.6%
$150k–$200k	2.3%
$200k+	2.3%
Median income	$61,438

Housing

Home values

Under $50k 12.2%

$50k–$100k 52.0%

$100k–$150k 14.6%

$150k–$200k 14.6%

$200k–$300k 5.7%

$500k–$1M 0.8%

Housing overview

Metric	Value
Median home value	$76,100
Median rent / month	$724
Owner occupied	57.2%
Renter occupied	42.8%
Vacant	8.9%
Single-family detached	95.8%
Large apartment buildings	0.0%
Mobile homes	1.7%
Median rooms	6.0
Avg household size (owned)	2.62

Year built

Era	%
2020 or later	0.0%
2010–2019	0.4%
2000–2009	2.1%
1990–1999	1.3%
1980–1989	0.8%
1970–1979	6.8%
1960–1969	3.8%
1950–1959	22.5%
1940–1949	3.8%
1939 or earlier	58.5%

Bedrooms

Size	% of units
No bedroom (studio)	10.2%
1 bedroom	5.9%
2 bedrooms	11.0%
3 bedrooms	48.3%
4 bedrooms	22.5%
5+ bedrooms	2.1%

Vehicles per household

Vehicles	% of households
No vehicle	2.3%
1 vehicle	18.1%
2 vehicles	40.9%
3 or more	38.6%

Heating fuel

Fuel type	%
Utility gas	3.3%
Electricity	16.3%
Propane / LP gas	79.1%
Fuel oil	1.4%

Households & families

Household type	Count	%
Married-couple family	136	63.3%
Cohabiting couple	25	11.6%
Male householder, no spouse	22	10.2%
Female householder, no spouse	32	14.9%
Households with children under 18	103	47.9%
Households with seniors (65+)	46	21.4%
Average household size	2.82

Marital status

Status	Male	Female
Never married	18.8%	22.5%
Married	71.0%	48.3%
Separated	0.0%	0.7%
Widowed	2.4%	2.2%
Divorced	7.7%	26.2%

Education

Less than 9th grade 1.2%

Some HS, no diploma 2.2%

HS graduate 42.3%

Some college, no degree 28.9%

Associate's degree 14.4%

Bachelor's degree 6.7%

Graduate / professional 4.3%

Metric	%
HS diploma or higher	96.7%
Bachelor's or higher	11.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	11	6.6%
Kindergarten	4	2.4%
Elementary school	90	53.9%
High school	51	30.5%
College / grad school	11	6.6%

Employment

Industry of employment

Manufacturing 23.6%

Education & healthcare 16.0%

Transportation & utilities 11.7%

Retail trade 11.4%

Construction 10.3%

Arts, food & hospitality 10.3%

Agriculture & mining 8.7%

Wholesale trade 2.7%

Other services 1.9%

Public administration 1.6%

Finance & real estate 1.1%

Professional & management 0.8%

Occupation

Category	%
Management, business & arts	26.3%
Service	16.3%
Sales & office	13.6%
Natural resources & construction	10.8%
Production & transportation	33.1%

Employment type

Type	%
Private sector	79.1%
Government	10.8%
Self-employed	10.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	79.9%
Carpool	6.5%
Public transit	0.0%
Walk	1.6%
Work from home	5.4%
Other means	6.5%
Avg commute (minutes)	30.5

Poverty

All people 17.7%

Under 18 years 40.0%

18 and over 8.2%

Married-couple families 0.7%

Female-led households 0.0%

Income support

Source	% of households
Social Security	19.5%
Retirement income	12.6%
Supplemental Security	6.5%
Cash public assistance	0.5%
Food stamps / SNAP	9.3%

Health indicators

Condition	%
Obesity	40.0%
High blood pressure	35.8%
High cholesterol	33.8%
Diabetes	10.4%
Heart disease	7.3%
Stroke	3.2%
Asthma	9.1%
Arthritis	26.3%
Kidney disease	3.0%
Pulmonary disease	7.0%
Cancer	7.8%

Behavior / access	%
Smoking	16.9%
Binge drinking	21.2%
No physical activity	24.3%
Less than 7 hrs sleep	30.2%
Depression	17.5%
Fair or poor health	12.6%
Poor mental health	12.9%
Poor physical health	9.7%
No health insurance	8.6%
Visited doctor (checkup)	75.6%
Visited dentist	66.9%
Cholesterol screening	89.3%
Teeth loss	12.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	11	2.6%

Disability	%
Any disability	5.1%
Under 18	0.0%
18–64 years	2.5%
65 and over	35.5%

Health insurance coverage

Type	%
Private insurance	57.1%
Public insurance	47.7%
No insurance	7.9%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	571	94.2%
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)	606	100.0%
Born in same state	606	100.0%
Born in different state	510	84.2%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
English	140	23.1%
Italian	60	9.9%
Arab	31	5.1%

Ancestry	Count	%
French	10	1.7%
Dutch	4	0.7%
Polish	2	0.3%

Technology access

Metric	% of households
Computer access	35.5%
Internet access	93.5%

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

Frequently asked questions about ZIP code 51433

What city is ZIP code 51433 in?

ZIP code 51433 is primarily assigned to Auburn, Iowa.

What county is ZIP code 51433 in?

ZIP code 51433 falls within Sac County, Iowa.

How educated is the population of ZIP code 51433?

11% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

What is the poverty rate in ZIP code 51433?

18% of residents in ZIP code 51433 live below the poverty line, above the national average.

What is the typical home value in ZIP code 51433?

The median home value in ZIP code 51433 is $76,100.

What is the population of ZIP code 51433?

ZIP code 51433 has an estimated population of 606 residents, with a density of 11 people per square mile.

What timezone is ZIP code 51433 in?

ZIP code 51433 observes the CST timezone.