51109 ZIP Code — Sioux City, IA

Woodbury County, Iowa

ZIP code 51109 is located in Sioux City, Iowa, within Woodbury County. It covers approximately 17.61 square miles and serves a population of 3,619 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51109

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 $127,700. Owner-occupancy is high at 81%, well above the national average.

Median household income is $73,158. 35% 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 14 minutes is near the national average.

College attainment at 4% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (23%) compared to national benchmarks.

Overall, ZIP code 51109 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

3,619

population

17.61

sq mi land

Standard

ZIP type

Central (CT)

timezone

51109 ZIP code map

Cities in ZIP code 51109

Below are the cities the US Postal Service accepts for ZIP code 51109. Using any city not on this list may result in mail delivery delays.

City	Status
Sioux City	Acceptable
Sioux City	Preferred

Nearby ZIP codes

57049 North Sioux City (2.9 mi) 51103 Sioux City (3.3 mi) 51104 Sioux City (4.3 mi) 68776 South Sioux City (5.7 mi) 57038 Jefferson (6.1 mi) 51101 Sioux City (6.2 mi) 51105 Sioux City (6.4 mi) 51108 Sioux City (6.9 mi) 68731 Dakota City (9.9 mi) 68743 Jackson (10.2 mi) 51106 Sioux City (10.6 mi) 51062 Westfield (10.7 mi)

Demographics updated 05/2026

Population
Total population	3,619
Population density	206 / sq mi
State FIPS	19
County FIPS	193

Geography
Land area	17.61 sq mi
Water area	0.84 sq mi
Latitude	42.5593
Longitude	-96.4805
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	45.6%	40.6%	40.1%
$50k – $100k	32.9%	33.9%	33.4%
$100k – $200k	20.5%	21.3%	21.5%
Over $200k	1.0%	4.2%	5.0%

Demographics & statistics

3,619

Population

206

People per sq mi

43.5

Median age

$73,158

Median household income

$33,752

Per capita income

$127,700

Median home value

$965

Median monthly rent

80.8%

Home ownership

15.0%

Poverty rate

2.5%

Unemployment

1,291

Housing units

3.9%

Bachelor's or higher

Age distribution

Male Female

Under 5

147

5–9

148

126

10–14

127

15–19

151

20–24

152

169

25–34

170

166

35–44

168

286

45–54

289

55–59

138

60–64

139

225

65–74

226

118

75–84

118

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	888	24.5%
18 and over	2,731	75.5%
65 and over	724	20.0%
Median age	43.5 years

Race & ethnicity

White 78.1%

Two or more races 10.4%

Hispanic or Latino 9.1%

Other race 1.6%

Asian 0.4%

Black or African American 0.3%

American Indian / Alaska Native 0.1%

Group	Count	%
White	3,111	78.1%
Two or more races	413	10.4%
Hispanic or Latino	362	9.1%
Other race	65	1.6%
Asian	14	0.4%
Black or African American	11	0.3%
American Indian / Alaska Native	5	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.6%	40.6%	40.1%
$50k – $100k	32.9%	33.9%	33.4%
$100k – $200k	20.5%	21.3%	21.5%
Over $200k	1.0%	4.2%	5.0%

Under $10k 1.1%

$10k–$15k 4.2%

$15k–$25k 11.5%

$25k–$35k 5.4%

$35k–$50k 19.9%

$50k–$75k 8.7%

$75k–$100k 21.1%

$100k–$150k 22.2%

$150k–$200k 2.7%

$200k+ 3.0%

Range	% of households
Under $10k	1.1%
$10k–$15k	4.2%
$15k–$25k	11.5%
$25k–$35k	5.4%
$35k–$50k	19.9%
$50k–$75k	8.7%
$75k–$100k	21.1%
$100k–$150k	22.2%
$150k–$200k	2.7%
$200k+	3.0%
Median income	$73,158

Housing

Home values

Under $50k 5.4%

$50k–$100k 29.7%

$100k–$150k 33.3%

$150k–$200k 12.8%

$200k–$300k 7.9%

$300k–$500k 7.3%

$1M+ 3.5%

Housing overview

Metric	Value
Median home value	$127,700
Median rent / month	$965
Owner occupied	80.8%
Renter occupied	19.2%
Vacant	2.7%
Single-family detached	86.6%
Large apartment buildings	0.0%
Mobile homes	0.6%
Median rooms	5.6
Avg household size (owned)	2.35

Year built

Era	%
2020 or later	0.0%
2010–2019	2.8%
2000–2009	8.7%
1990–1999	9.2%
1980–1989	3.7%
1970–1979	9.0%
1960–1969	20.3%
1950–1959	14.1%
1940–1949	3.9%
1939 or earlier	28.4%

Bedrooms

Size	% of units
No bedroom (studio)	0.4%
1 bedroom	11.5%
2 bedrooms	34.6%
3 bedrooms	45.9%
4 bedrooms	5.3%
5+ bedrooms	2.3%

Vehicles per household

Vehicles	% of households
No vehicle	2.8%
1 vehicle	38.7%
2 vehicles	30.1%
3 or more	28.4%

Heating fuel

Fuel type	%
Utility gas	70.2%
Electricity	25.8%
Propane / LP gas	4.0%

Households & families

Household type	Count	%
Married-couple family	594	38.5%
Cohabiting couple	217	14.1%
Male householder, no spouse	256	16.6%
Female householder, no spouse	477	30.9%
Households with children under 18	446	28.9%
Households with seniors (65+)	531	34.4%
Average household size	2.34

Marital status

Status	Male	Female
Never married	38.5%	27.7%
Married	44.5%	43.1%
Separated	2.3%	1.4%
Widowed	1.0%	11.2%
Divorced	13.8%	16.8%

Education

Less than 9th grade 5.5%

Some HS, no diploma 10.5%

HS graduate 42.8%

Some college, no degree 24.7%

Associate's degree 12.5%

Bachelor's degree 2.7%

Graduate / professional 1.2%

Metric	%
HS diploma or higher	84.0%
Bachelor's or higher	3.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	81	9.4%
Kindergarten	29	3.4%
Elementary school	425	49.3%
High school	181	21.0%
College / grad school	146	16.9%

Employment

Industry of employment

Education & healthcare 20.0%

Manufacturing 17.7%

Arts, food & hospitality 14.1%

Retail trade 10.5%

Finance & real estate 10.0%

Professional & management 5.8%

Construction 5.6%

Transportation & utilities 5.6%

Other services 5.3%

Wholesale trade 2.6%

Agriculture & mining 1.6%

Public administration 0.8%

Information 0.4%

Occupation

Category	%
Management, business & arts	24.3%
Service	19.0%
Sales & office	20.9%
Natural resources & construction	15.8%
Production & transportation	20.0%

Employment type

Type	%
Private sector	83.8%
Government	12.8%
Self-employed	3.0%
Unpaid family workers	0.5%

Commute

Method	%
Drive alone	89.6%
Carpool	7.2%
Public transit	0.0%
Walk	0.0%
Work from home	2.8%
Other means	0.4%
Avg commute (minutes)	13.6

Poverty

All people 15.0%

Under 18 years 33.2%

18 and over 9.2%

Married-couple families 0.0%

Female-led households 42.9%

Income support

Source	% of households
Social Security	35.2%
Retirement income	26.4%
Supplemental Security	8.9%
Cash public assistance	2.7%
Food stamps / SNAP	12.6%

Health indicators

Condition	%
Obesity	39.4%
High blood pressure	35.2%
High cholesterol	35.5%
Diabetes	12.3%
Heart disease	7.3%
Stroke	3.6%
Asthma	9.9%
Arthritis	26.2%
Kidney disease	3.2%
Pulmonary disease	8.7%
Cancer	6.7%

Behavior / access	%
Smoking	22.7%
Binge drinking	20.4%
No physical activity	31.1%
Less than 7 hrs sleep	33.6%
Depression	18.9%
Fair or poor health	16.8%
Poor mental health	15.2%
Poor physical health	11.9%
No health insurance	13.1%
Visited doctor (checkup)	76.1%
Visited dentist	62.0%
Cholesterol screening	86.3%
Teeth loss	18.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	284	10.4%

Disability	%
Any disability	16.2%
Under 18	9.9%
18–64 years	12.7%
65 and over	33.8%

Health insurance coverage

Type	%
Private insurance	64.6%
Public insurance	43.5%
No insurance	5.7%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	3,424	94.6%
Spanish	117	3.4%
Other Indo-European	117	3.4%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	3,494	96.5%
Born in same state	3,494	96.5%
Born in different state	2,648	73.2%
Foreign born	0	0.0%
Naturalized citizen	125	3.5%
Not a US citizen	64	51.2%

Ancestry

Ancestry	Count	%
Italian	517	14.3%
French	202	5.6%
Arab	172	4.8%
English	121	3.3%

Ancestry	Count	%
Dutch	64	1.8%
Polish	53	1.5%
German	36	1%

Technology access

Metric	% of households
Computer access	42.7%
Internet access	91.5%

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

Frequently asked questions about ZIP code 51109

What city is ZIP code 51109 in?

ZIP code 51109 is primarily assigned to Sioux City, Iowa.

What county is ZIP code 51109 in?

ZIP code 51109 falls within Woodbury County, Iowa.

How educated is the population of ZIP code 51109?

4% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Is ZIP code 51109 mostly owner-occupied?

81% of occupied units in ZIP code 51109 are owner-occupied, well above the national average.

What is the typical home value in ZIP code 51109?

The median home value in ZIP code 51109 is $127,700.

Does ZIP code 51109 have a large veteran population?

10% of civilians in ZIP code 51109 are veterans, above the national average of ~7%.

What timezone is ZIP code 51109 in?

ZIP code 51109 observes the CST timezone.