51105 ZIP Code — Sioux City, IA

Woodbury County, Iowa

ZIP code 51105 is located in Sioux City, Iowa, within Woodbury County. It covers approximately 5.95 square miles and serves a population of 11,214 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51105

The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $86,000. Renters make up the majority at 56%, typical of denser urban areas.

Median household income is $47,018. Poverty affects 23% of residents, above the national average. SNAP benefit usage at 22% of households reflects economic stress in the area.

The dominant occupation class is production, transportation, and material moving, with manufacturing as the leading industry. The average commute of 19 minutes is near the national average.

College attainment at 7% 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.

Notable community characteristics include Spanish spoken in 23% of households.

Overall, ZIP code 51105 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, and elevated reliance on food assistance.

11,214

population

5.95

sq mi land

Standard

ZIP type

Central (CT)

timezone

51105 ZIP code map

Cities in ZIP code 51105

Below are the cities the US Postal Service accepts for ZIP code 51105. Using any city not on this list may result in mail delivery delays.

City	Status
Sioux City	Preferred

Nearby ZIP codes

51101 Sioux City (2.1 mi) 51104 Sioux City (2.2 mi) 51108 Sioux City (3.2 mi) 51103 Sioux City (3.6 mi) 51106 Sioux City (4.4 mi) 68776 South Sioux City (5.2 mi) 51109 Sioux City (6.4 mi) 57049 North Sioux City (6.8 mi) 51111 Sioux City (6.9 mi) 68731 Dakota City (8.4 mi) 51024 Hinton (8.8 mi) 51054 Sergeant Bluff (9.6 mi)

Demographics updated 05/2026

Population
Total population	11,214
Population density	1,885 / sq mi
State FIPS	19
County FIPS	193

Geography
Land area	5.95 sq mi
Water area	0.03 sq mi
Latitude	42.5133
Longitude	-96.3707
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	54.0%	40.6%	40.1%
$50k – $100k	33.9%	33.9%	33.4%
$100k – $200k	11.6%	21.3%	21.5%
Over $200k	0.6%	4.2%	5.0%

Demographics & statistics

11,214

Population

1,885

People per sq mi

30.5

Median age

$47,018

Median household income

$21,923

Per capita income

$86,000

Median home value

$809

Median monthly rent

43.7%

Home ownership

22.5%

Poverty rate

6.3%

Unemployment

2,030

Housing units

7.4%

Bachelor's or higher

Age distribution

Male Female

588

Under 5

587

479

5–9

479

375

10–14

374

586

15–19

586

319

20–24

318

918

25–34

918

816

35–44

816

753

45–54

753

174

55–59

173

235

60–64

234

269

65–74

268

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	3,668	32.7%
18 and over	7,546	67.3%
65 and over	733	6.5%
Median age	30.5 years

Race & ethnicity

White 44.6%

Two or more races 21%

Hispanic or Latino 16.8%

Black or African American 9.9%

American Indian / Alaska Native 3%

Other race 1.9%

Asian 1.7%

Native Hawaiian / Pacific Islander 1.2%

Group	Count	%
White	6,014	44.6%
Two or more races	2,832	21%
Hispanic or Latino	2,267	16.8%
Black or African American	1,329	9.9%
American Indian / Alaska Native	400	3%
Other race	254	1.9%
Asian	228	1.7%
Native Hawaiian / Pacific Islander	157	1.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	54.0%	40.6%	40.1%
$50k – $100k	33.9%	33.9%	33.4%
$100k – $200k	11.6%	21.3%	21.5%
Over $200k	0.6%	4.2%	5.0%

Under $10k 6.9%

$10k–$15k 4.3%

$15k–$25k 8.5%

$25k–$35k 13.8%

$35k–$50k 18.6%

$50k–$75k 15.3%

$75k–$100k 10.7%

$100k–$150k 18.0%

$150k–$200k 2.1%

$200k+ 1.9%

Range	% of households
Under $10k	6.9%
$10k–$15k	4.3%
$15k–$25k	8.5%
$25k–$35k	13.8%
$35k–$50k	18.6%
$50k–$75k	15.3%
$75k–$100k	10.7%
$100k–$150k	18.0%
$150k–$200k	2.1%
$200k+	1.9%
Median income	$47,018

Housing

Home values

Under $50k 17.7%

$50k–$100k 45.3%

$100k–$150k 22.9%

$150k–$200k 6.9%

$200k–$300k 6.6%

$500k–$1M 0.6%

Housing overview

Metric	Value
Median home value	$86,000
Median rent / month	$809
Owner occupied	43.7%
Renter occupied	56.3%
Vacant	7.7%
Single-family detached	48.9%
Large apartment buildings	9.9%
Mobile homes	13.7%
Median rooms	4.7
Avg household size (owned)	3.14

Year built

Era	%
2020 or later	0.1%
2010–2019	4.0%
2000–2009	4.3%
1990–1999	5.7%
1980–1989	1.9%
1970–1979	5.3%
1960–1969	6.5%
1950–1959	8.9%
1940–1949	7.6%
1939 or earlier	55.7%

Bedrooms

Size	% of units
No bedroom (studio)	10.0%
1 bedroom	12.9%
2 bedrooms	33.4%
3 bedrooms	32.8%
4 bedrooms	7.8%
5+ bedrooms	3.1%

Vehicles per household

Vehicles	% of households
No vehicle	14.0%
1 vehicle	39.7%
2 vehicles	25.8%
3 or more	20.6%

Heating fuel

Fuel type	%
Utility gas	71.7%
Electricity	21.0%
Propane / LP gas	4.9%
No fuel used	0.8%

Households & families

Household type	Count	%
Married-couple family	1,265	32.5%
Cohabiting couple	476	12.2%
Male householder, no spouse	1,058	27.1%
Female householder, no spouse	1,099	28.2%
Households with children under 18	1,664	42.7%
Households with seniors (65+)	628	16.1%
Average household size	2.87

Marital status

Status	Male	Female
Never married	45.8%	44.4%
Married	37.1%	38.0%
Separated	2.0%	1.7%
Widowed	2.7%	5.8%
Divorced	12.4%	10.1%

Education

Less than 9th grade 16.5%

Some HS, no diploma 14.9%

HS graduate 38.4%

Some college, no degree 18.2%

Associate's degree 4.6%

Bachelor's degree 5.6%

Graduate / professional 1.8%

Metric	%
HS diploma or higher	68.6%
Bachelor's or higher	7.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	213	6.8%
Kindergarten	183	5.8%
Elementary school	1,386	44.1%
High school	934	29.7%
College / grad school	429	13.6%

Employment

Industry of employment

Manufacturing 36.8%

Arts, food & hospitality 10.8%

Professional & management 9.8%

Construction 8.7%

Retail trade 8.7%

Education & healthcare 8.7%

Transportation & utilities 5.2%

Other services 3.4%

Finance & real estate 3.2%

Information 1.6%

Public administration 1.4%

Agriculture & mining 0.8%

Wholesale trade 0.8%

Occupation

Category	%
Management, business & arts	10.9%
Service	19.4%
Sales & office	14.1%
Natural resources & construction	9.9%
Production & transportation	45.6%

Employment type

Type	%
Private sector	93.0%
Government	2.6%
Self-employed	4.1%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	71.5%
Carpool	20.5%
Public transit	1.9%
Walk	3.6%
Work from home	2.2%
Other means	0.2%
Avg commute (minutes)	18.9

Poverty

All people 22.5%

Under 18 years 29.6%

18 and over 19.0%

Married-couple families 14.0%

Female-led households 30.2%

Income support

Source	% of households
Social Security	23.7%
Retirement income	11.1%
Supplemental Security	6.6%
Cash public assistance	4.2%
Food stamps / SNAP	21.5%

Health indicators

Condition	%
Obesity	41.3%
High blood pressure	30.7%
High cholesterol	30.4%
Diabetes	12.3%
Heart disease	5.7%
Stroke	3.0%
Asthma	10.0%
Arthritis	20.6%
Kidney disease	2.8%
Pulmonary disease	7.1%
Cancer	4.5%

Behavior / access	%
Smoking	23.2%
Binge drinking	20.6%
No physical activity	34.9%
Less than 7 hrs sleep	36.1%
Depression	18.3%
Fair or poor health	18.9%
Poor mental health	16.5%
Poor physical health	11.7%
No health insurance	19.9%
Visited doctor (checkup)	74.1%
Visited dentist	55.6%
Cholesterol screening	81.8%
Teeth loss	19.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	251	3.3%

Disability	%
Any disability	12.8%
Under 18	3.4%
18–64 years	16.8%
65 and over	22.4%

Health insurance coverage

Type	%
Private insurance	46.7%
Public insurance	51.6%
No insurance	13.9%
Uninsured under 19	4.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	10,039	89.5%
Spanish	2,284	22.8%
Other Indo-European	1,713	17.1%
Asian & Pacific Islander	0	0.0%
Other languages	245	2.4%

Place of birth & citizenship

Origin	Count	%
Native born (US)	8,671	77.3%
Born in same state	8,382	74.7%
Born in different state	5,813	51.8%
Foreign born	289	2.6%
Naturalized citizen	2,543	22.7%
Not a US citizen	718	28.2%

Ancestry

Ancestry	Count	%
Arab	784	7%
Italian	557	5%
French	450	4%
English	200	1.8%

Ancestry	Count	%
Polish	197	1.8%
Dutch	88	0.8%
German	9	0.1%

Technology access

Metric	% of households
Computer access	34.8%
Internet access	89.6%

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

Frequently asked questions about ZIP code 51105

What city is ZIP code 51105 in?

ZIP code 51105 is primarily assigned to Sioux City, Iowa.

What county is ZIP code 51105 in?

ZIP code 51105 falls within Woodbury County, Iowa.

Is ZIP code 51105 family-oriented?

33% of residents in ZIP code 51105 are under 18, reflecting a younger, family-oriented community.

How educated is the population of ZIP code 51105?

7% 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 51105?

23% of residents in ZIP code 51105 live below the poverty line, above the national average.

Is Spanish widely spoken in ZIP code 51105?

Approximately 23% of households in ZIP code 51105 speak Spanish as a primary language.

What timezone is ZIP code 51105 in?

ZIP code 51105 observes the CST timezone.