51103 ZIP Code — Sioux City, IA

Woodbury County, Iowa

ZIP code 51103 is located in Sioux City, Iowa, within Woodbury County. It covers approximately 12.06 square miles and serves a population of 17,005 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51103

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 $118,000. Owner-occupancy sits near the national average at 63%.

Median household income is $55,284. Poverty affects 21% of residents, above the national average. SNAP benefit usage at 22% of households reflects economic stress in the area. 34% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is production, transportation, and material moving, with education and healthcare as the leading industry. The average commute of 17 minutes is near the national average.

College attainment at 16% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (22%) compared to national benchmarks.

Overall, ZIP code 51103 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, a significant Social Security-dependent population, and elevated reliance on food assistance.

17,005

population

12.06

sq mi land

Standard

ZIP type

Central (CT)

timezone

51103 ZIP code map

Cities in ZIP code 51103

Below are the cities the US Postal Service accepts for ZIP code 51103. Using any city not on this list may result in mail delivery delays.

City	Status
Sioux City	Preferred

Nearby ZIP codes

51104 Sioux City (2.2 mi) 51101 Sioux City (2.9 mi) 68776 South Sioux City (3.1 mi) 57049 North Sioux City (3.2 mi) 51109 Sioux City (3.3 mi) 51105 Sioux City (3.6 mi) 51108 Sioux City (5.5 mi) 51106 Sioux City (7.4 mi) 68731 Dakota City (7.4 mi) 51111 Sioux City (7.8 mi) 57038 Jefferson (8.9 mi) 68743 Jackson (10.6 mi)

Demographics updated 05/2026

Population
Total population	17,005
Population density	1,410 / sq mi
State FIPS	19
County FIPS	193

Geography
Land area	12.06 sq mi
Water area	0.18 sq mi
Latitude	42.5207
Longitude	-96.4416
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	52.6%	40.6%	40.1%
$50k – $100k	31.1%	33.9%	33.4%
$100k – $200k	14.9%	21.3%	21.5%
Over $200k	1.5%	4.2%	5.0%

Demographics & statistics

17,005

Population

1,410

People per sq mi

35.0

Median age

$55,284

Median household income

$25,614

Per capita income

$118,000

Median home value

$883

Median monthly rent

62.5%

Home ownership

20.9%

Poverty rate

4.5%

Unemployment

4,387

Housing units

15.7%

Bachelor's or higher

Age distribution

Male Female

523

Under 5

558

628

5–9

669

760

10–14

810

631

15–19

672

551

20–24

588

1,025

25–34

1,093

881

35–44

940

975

45–54

1,040

517

55–59

551

489

60–64

521

831

65–74

885

270

75–84

287

150

85+

160

← Male

Female →

Age summary

Group	Count	%
Under 18	4,728	27.8%
18 and over	12,277	72.2%
65 and over	2,583	15.2%
Median age	35.0 years

Race & ethnicity

White 53.6%

Hispanic or Latino 16.3%

Two or more races 13%

Other race 7.4%

American Indian / Alaska Native 3.8%

Asian 3.4%

Black or African American 2.5%

Group	Count	%
White	10,881	53.6%
Hispanic or Latino	3,311	16.3%
Two or more races	2,649	13%
Other race	1,498	7.4%
American Indian / Alaska Native	780	3.8%
Asian	698	3.4%
Black or African American	499	2.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	52.6%	40.6%	40.1%
$50k – $100k	31.1%	33.9%	33.4%
$100k – $200k	14.9%	21.3%	21.5%
Over $200k	1.5%	4.2%	5.0%

Under $10k 4.3%

$10k–$15k 9.6%

$15k–$25k 10.9%

$25k–$35k 7.9%

$35k–$50k 11.5%

$50k–$75k 22.6%

$75k–$100k 11.4%

$100k–$150k 16.8%

$150k–$200k 2.9%

$200k+ 2.1%

Range	% of households
Under $10k	4.3%
$10k–$15k	9.6%
$15k–$25k	10.9%
$25k–$35k	7.9%
$35k–$50k	11.5%
$50k–$75k	22.6%
$75k–$100k	11.4%
$100k–$150k	16.8%
$150k–$200k	2.9%
$200k+	2.1%
Median income	$55,284

Housing

Home values

Under $50k 8.6%

$50k–$100k 29.9%

$100k–$150k 32.4%

$150k–$200k 12.6%

$200k–$300k 10.5%

$300k–$500k 3.8%

$500k–$1M 2.0%

$1M+ 0.2%

Housing overview

Metric	Value
Median home value	$118,000
Median rent / month	$883
Owner occupied	62.5%
Renter occupied	37.5%
Vacant	5.4%
Single-family detached	75.8%
Large apartment buildings	5.2%
Mobile homes	2.5%
Median rooms	5.7
Avg household size (owned)	2.45

Year built

Era	%
2020 or later	0.0%
2010–2019	3.0%
2000–2009	4.9%
1990–1999	5.7%
1980–1989	2.4%
1970–1979	8.9%
1960–1969	9.5%
1950–1959	12.1%
1940–1949	15.2%
1939 or earlier	38.4%

Bedrooms

Size	% of units
No bedroom (studio)	2.7%
1 bedroom	10.6%
2 bedrooms	29.3%
3 bedrooms	36.6%
4 bedrooms	16.9%
5+ bedrooms	3.9%

Vehicles per household

Vehicles	% of households
No vehicle	10.3%
1 vehicle	31.5%
2 vehicles	36.7%
3 or more	21.4%

Heating fuel

Fuel type	%
Utility gas	69.1%
Electricity	26.3%
Propane / LP gas	2.4%
No fuel used	2.2%

Households & families

Household type	Count	%
Married-couple family	2,318	36.0%
Cohabiting couple	660	10.3%
Male householder, no spouse	1,250	19.4%
Female householder, no spouse	2,203	34.3%
Households with children under 18	2,263	35.2%
Households with seniors (65+)	2,010	31.3%
Average household size	2.57

Marital status

Status	Male	Female
Never married	40.4%	35.7%
Married	42.3%	36.0%
Separated	2.2%	2.0%
Widowed	3.6%	7.1%
Divorced	11.4%	19.1%

Education

Less than 9th grade 12.1%

Some HS, no diploma 10.5%

HS graduate 33.8%

Some college, no degree 19.5%

Associate's degree 8.4%

Bachelor's degree 11.2%

Graduate / professional 4.5%

Metric	%
HS diploma or higher	77.5%
Bachelor's or higher	15.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	173	3.9%
Kindergarten	216	4.9%
Elementary school	2,432	55.0%
High school	1,108	25.1%
College / grad school	492	11.1%

Employment

Industry of employment

Education & healthcare 22.5%

Manufacturing 21.4%

Retail trade 11.7%

Arts, food & hospitality 10.9%

Construction 9.5%

Professional & management 5.3%

Finance & real estate 4.1%

Other services 3.9%

Wholesale trade 3.1%

Transportation & utilities 2.8%

Agriculture & mining 1.8%

Public administration 1.7%

Information 1.3%

Occupation

Category	%
Management, business & arts	24.2%
Service	18.4%
Sales & office	17.9%
Natural resources & construction	13.6%
Production & transportation	25.9%

Employment type

Type	%
Private sector	85.4%
Government	8.2%
Self-employed	6.3%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	79.3%
Carpool	10.9%
Public transit	2.5%
Walk	1.3%
Work from home	5.3%
Other means	0.6%
Avg commute (minutes)	16.8

Poverty

All people 20.9%

Under 18 years 26.6%

18 and over 18.7%

Married-couple families 6.6%

Female-led households 38.4%

Income support

Source	% of households
Social Security	33.8%
Retirement income	19.6%
Supplemental Security	8.5%
Cash public assistance	3.8%
Food stamps / SNAP	22.3%

Health indicators

Condition	%
Obesity	40.6%
High blood pressure	32.7%
High cholesterol	30.9%
Diabetes	12.6%
Heart disease	6.5%
Stroke	3.4%
Asthma	10.0%
Arthritis	23.1%
Kidney disease	3.1%
Pulmonary disease	7.7%
Cancer	5.6%

Behavior / access	%
Smoking	21.9%
Binge drinking	20.1%
No physical activity	33.2%
Less than 7 hrs sleep	34.9%
Depression	18.3%
Fair or poor health	18.2%
Poor mental health	15.9%
Poor physical health	11.8%
No health insurance	17.0%
Visited doctor (checkup)	75.6%
Visited dentist	58.8%
Cholesterol screening	83.7%
Teeth loss	19.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	689	5.6%

Disability	%
Any disability	17.0%
Under 18	6.0%
18–64 years	16.8%
65 and over	39.8%

Health insurance coverage

Type	%
Private insurance	52.4%
Public insurance	50.8%
No insurance	8.3%
Uninsured under 19	2.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	15,924	93.6%
Spanish	2,103	13.2%
Other Indo-European	1,604	10.1%
Asian & Pacific Islander	21	0.1%
Other languages	455	2.9%

Place of birth & citizenship

Origin	Count	%
Native born (US)	14,525	85.4%
Born in same state	14,188	83.4%
Born in different state	9,658	56.8%
Foreign born	337	2.0%
Naturalized citizen	2,480	14.6%
Not a US citizen	1,136	45.8%

Ancestry

Ancestry	Count	%
Italian	1,087	6.4%
Arab	791	4.7%
French	611	3.6%
Polish	529	3.1%
English	487	2.9%

Ancestry	Count	%
Dutch	213	1.3%
German	106	0.6%
Norwegian	10	0.1%
Irish	5	0%

Technology access

Metric	% of households
Computer access	37.8%
Internet access	87.3%

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

Frequently asked questions about ZIP code 51103

What city is ZIP code 51103 in?

ZIP code 51103 is primarily assigned to Sioux City, Iowa.

What county is ZIP code 51103 in?

ZIP code 51103 falls within Woodbury County, Iowa.

What is the poverty rate in ZIP code 51103?

21% of residents in ZIP code 51103 live below the poverty line, above the national average.

What is the typical home value in ZIP code 51103?

The median home value in ZIP code 51103 is $118,000.

What is the population of ZIP code 51103?

ZIP code 51103 has an estimated population of 17,005 residents, with a density of 1,410 people per square mile.

What is the median household income in ZIP code 51103?

The median household income in ZIP code 51103 is $55,284, below the national median of ~$75,000.

What timezone is ZIP code 51103 in?

ZIP code 51103 observes the CST timezone.