51101 ZIP Code — Sioux City, IA

Woodbury County, Iowa

ZIP code 51101 is located in Sioux City, Iowa, within Woodbury County. It covers approximately 1.20 square miles and serves a population of 1,070 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51101

The housing stock consists of a significant share of large multi-unit buildings. Most homes were built in the pre-1940, giving the area an established character. Median home value is $219,600. Renters make up the majority at 89%, typical of denser urban areas.

Median household income is $17,452. Poverty affects 32% of residents, above the national average. SNAP benefit usage at 19% of households reflects economic stress in the area.

The dominant occupation class is service, with arts, entertainment, and food service as the leading industry. The average commute of 9 minutes is near the national average.

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

Health indicators show elevated rates of smoking (25%) compared to national benchmarks.

Notable community characteristics include disability rates above the national average at 52%.

Overall, ZIP code 51101 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, and elevated reliance on food assistance.

1,070
population
1.20
sq mi land
Standard
ZIP type
Central (CT)
timezone
51101 ZIP code map
Cities in ZIP code 51101

Below are the cities the US Postal Service accepts for ZIP code 51101. Using any city not on this list may result in mail delivery delays.

City Status
Sioux City Acceptable
Sioux City Preferred
Nearby ZIP codes
51105 Sioux City (2.1 mi) 51103 Sioux City (2.9 mi) 51104 Sioux City (3 mi) 68776 South Sioux City (3.3 mi) 51106 Sioux City (4.5 mi) 51108 Sioux City (5.2 mi) 51111 Sioux City (5.4 mi) 57049 North Sioux City (5.7 mi) 51109 Sioux City (6.2 mi) 68731 Dakota City (6.3 mi) 51054 Sergeant Bluff (8.6 mi) 51024 Hinton (10.9 mi)
Demographics updated 05/2026
Population
Total population 1,070
Population density 892 / sq mi
State FIPS 19
County FIPS 193
Geography
Land area 1.20 sq mi
Water area 0.02 sq mi
Latitude 42.4916
Longitude -96.3994
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 90.3% 40.6% 40.1%
$50k – $100k 4.9% 33.9% 33.4%
$100k – $200k 0.0% 21.3% 21.5%
Over $200k 4.9% 4.2% 5.0%

Demographics & statistics

1,070
Population
892
People per sq mi
32.2
Median age
$17,452
Median household income
$25,749
Per capita income
$219,600
Median home value
$544
Median monthly rent
10.6%
Home ownership
32.1%
Poverty rate
4.9%
Unemployment
212
Housing units
17.8%
Bachelor's or higher

Age distribution

Male Female
9
5–9
8
11
10–14
10
12
15–19
10
126
20–24
105
154
25–34
129
75
35–44
62
38
45–54
31
42
55–59
35
57
60–64
47
33
65–74
27
26
75–84
22
1
85+
0
← Male
Female →

Age summary

GroupCount%
Under 18444.1%
18 and over1,02695.9%
65 and over10910.2%
Median age32.2 years

Race & ethnicity

White 54.9%
Native Hawaiian / Pacific Islander 18.3%
Black or African American 8.6%
Asian 7.2%
Two or more races 6.2%
Hispanic or Latino 3.1%
American Indian / Alaska Native 1.3%
Other race 0.5%
GroupCount%
White60654.9%
Native Hawaiian / Pacific Islander20218.3%
Black or African American958.6%
Asian797.2%
Two or more races686.2%
Hispanic or Latino343.1%
American Indian / Alaska Native141.3%
Other race60.5%

Household income

Income range This ZIP County avg State avg
Under $50k 90.3% 40.6% 40.1%
$50k – $100k 4.9% 33.9% 33.4%
$100k – $200k 0.0% 21.3% 21.5%
Over $200k 4.9% 4.2% 5.0%
Under $10k 19.4%
$10k–$15k 20.9%
$15k–$25k 16.7%
$25k–$35k 8.2%
$35k–$50k 15.2%
$50k–$75k 7.8%
$75k–$100k 5.1%
$100k–$150k 1.7%
$200k+ 4.9%
Range% of households
Under $10k19.4%
$10k–$15k20.9%
$15k–$25k16.7%
$25k–$35k8.2%
$35k–$50k15.2%
$50k–$75k7.8%
$75k–$100k5.1%
$100k–$150k1.7%
$200k+4.9%
Median income$17,452

Housing

Home values

$150k–$200k 33.9%
$200k–$300k 66.1%

Housing overview

MetricValue
Median home value$219,600
Median rent / month$544
Owner occupied10.6%
Renter occupied89.4%
Vacant22.9%
Single-family detached2.1%
Large apartment buildings64.4%
Mobile homes0.0%
Median rooms3.0
Avg household size (owned)1.59

Year built

Era%
2020 or later2.8%
2010–20190.0%
2000–20090.0%
1990–199911.1%
1980–19890.0%
1970–197917.0%
1960–19699.4%
1950–19594.4%
1940–19491.9%
1939 or earlier53.4%

Bedrooms

Size% of units
No bedroom (studio)15.8%
1 bedroom62.8%
2 bedrooms13.0%
3 bedrooms3.8%
4 bedrooms0.0%
5+ bedrooms4.5%

Vehicles per household

Vehicles% of households
No vehicle35.7%
1 vehicle46.6%
2 vehicles17.7%
3 or more0.0%

Heating fuel

Fuel type%
Utility gas14.3%
Electricity71.5%
Propane / LP gas5.9%
No fuel used1.1%

Households & families

Household typeCount%
Married-couple family5410.3%
Cohabiting couple132.5%
Male householder, no spouse32461.6%
Female householder, no spouse13525.7%
Households with children under 18407.6%
Households with seniors (65+)9718.4%
Average household size1.60

Marital status

StatusMaleFemale
Never married64.3%53.5%
Married9.6%12.7%
Separated2.6%7.9%
Widowed0.2%9.6%
Divorced23.3%16.4%

Education

Less than 9th grade 3.6%
Some HS, no diploma 9.8%
HS graduate 27.6%
Some college, no degree 27.0%
Associate's degree 14.2%
Bachelor's degree 13.5%
Graduate / professional 4.4%
Metric%
HS diploma or higher86.6%
Bachelor's or higher17.8%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool00.0%
Kindergarten00.0%
Elementary school1116.4%
High school2638.8%
College / grad school3044.8%

Employment

Industry of employment

Arts, food & hospitality 55.2%
Professional & management 15.5%
Manufacturing 10.8%
Education & healthcare 8.8%
Finance & real estate 4.8%
Information 2.6%
Retail trade 2.4%

Occupation

Category%
Management, business & arts16.9%
Service54.4%
Sales & office15.9%
Natural resources & construction2.6%
Production & transportation10.2%

Employment type

Type%
Private sector96.6%
Government3.4%
Self-employed0.0%
Unpaid family workers0.0%

Commute

Method%
Drive alone81.9%
Carpool0.0%
Public transit0.0%
Walk15.7%
Work from home0.0%
Other means2.4%
Avg commute (minutes)9.3

Poverty

All people 32.1%
Under 18 years 53.1%
18 and over 31.3%
Married-couple families 0.0%
Female-led households 0.0%

Income support

Source% of households
Social Security26.4%
Retirement income17.1%
Supplemental Security16.0%
Cash public assistance5.3%
Food stamps / SNAP18.6%

Health indicators

Condition%
Obesity43.0%
High blood pressure35.9%
High cholesterol33.3%
Diabetes14.2%
Heart disease7.4%
Stroke4.0%
Asthma10.3%
Arthritis25.6%
Kidney disease3.5%
Pulmonary disease9.2%
Cancer6.0%
Behavior / access%
Smoking24.5%
Binge drinking20.1%
No physical activity35.4%
Less than 7 hrs sleep36.0%
Depression18.3%
Fair or poor health20.6%
Poor mental health16.0%
Poor physical health13.3%
No health insurance17.2%
Visited doctor (checkup)76.0%
Visited dentist55.2%
Cholesterol screening83.5%
Teeth loss22.5%

Veterans & disability

VeteransCount%
Civilian veterans373.6%
Disability%
Any disability52.2%
Under 180.0%
18–64 years49.6%
65 and over85.6%

Health insurance coverage

Type%
Private insurance33.8%
Public insurance62.3%
No insurance9.7%
Uninsured under 190.0%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only1,070100.0%
Spanish565.2%
Other Indo-European131.2%
Asian & Pacific Islander00.0%
Other languages434.0%

Place of birth & citizenship

OriginCount%
Native born (US)97891.4%
Born in same state97791.3%
Born in different state45242.2%
Foreign born10.1%
Naturalized citizen928.6%
Not a US citizen1920.7%

Ancestry

AncestryCount%
Italian21720.3%
French736.8%
Arab605.6%
AncestryCount%
English494.6%
Polish131.2%

Technology access

Metric% of households
Computer access49.2%
Internet access86.5%

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

Frequently asked questions about ZIP code 51101

What city is ZIP code 51101 in?

ZIP code 51101 is primarily assigned to Sioux City, Iowa.

What county is ZIP code 51101 in?

ZIP code 51101 falls within Woodbury County, Iowa.

Is ZIP code 51101 mostly rentals?

89% of occupied units in ZIP code 51101 are renter-occupied.

What is the poverty rate in ZIP code 51101?

32% of residents in ZIP code 51101 live below the poverty line, above the national average.

What is the median household income in ZIP code 51101?

The median household income in ZIP code 51101 is $17,452, below the national median of ~$75,000.

What is the population of ZIP code 51101?

ZIP code 51101 has an estimated population of 1,070 residents, with a density of 889 people per square mile.

What timezone is ZIP code 51101 in?

ZIP code 51101 observes the CST timezone.

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