51111 ZIP Code — Sioux City, IA

Woodbury County, Iowa

ZIP code 51111 is located in Sioux City, Iowa, within Woodbury County. It covers approximately 6.06 square miles and serves a population of 124 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

124

population

6.06

sq mi land

Standard

ZIP type

Central (CT)

timezone

51111 ZIP code map

Cities in ZIP code 51111

Below are the cities the US Postal Service accepts for ZIP code 51111. Using any city not on this list may result in mail delivery delays.

City	Status
Sioux City	Preferred

Nearby ZIP codes

51054 Sergeant Bluff (3.9 mi) 68731 Dakota City (4.2 mi) 51106 Sioux City (4.6 mi) 51101 Sioux City (5.4 mi) 68776 South Sioux City (5.8 mi) 51105 Sioux City (6.9 mi) 68030 Homer (7.1 mi) 51103 Sioux City (7.8 mi) 51104 Sioux City (8.4 mi) 51052 Salix (9.1 mi) 57049 North Sioux City (9.4 mi) 51108 Sioux City (10 mi)

Demographics updated 05/2026

Population
Total population	124
Population density	20 / sq mi
State FIPS	19
County FIPS	193

Geography
Land area	6.06 sq mi
Water area	0.24 sq mi
Latitude	42.4145
Longitude	-96.3879
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	69.4%	40.6%	40.1%
$50k – $100k	30.6%	33.9%	33.4%
$100k – $200k	0.0%	21.3%	21.5%
Over $200k	0.0%	4.2%	5.0%

Demographics & statistics

124

Population

People per sq mi

6.0

Median age

$43,977

Median household income

$19,154

Per capita income

Median home value

$981

Median monthly rent

0.0%

Home ownership

0.0%

Poverty rate

0.0%

Unemployment

Housing units

0.0%

Bachelor's or higher

Age distribution

Male Female

5–9

35–44

45–54

75–84

← Male

Female →

Age summary

Group	Count	%
Under 18	65	52.4%
18 and over	59	47.6%
65 and over	15	12.1%
Median age	6.0 years

Race & ethnicity

White 100%

Group	Count	%
White	124	100%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	69.4%	40.6%	40.1%
$50k – $100k	30.6%	33.9%	33.4%
$100k – $200k	0.0%	21.3%	21.5%
Over $200k	0.0%	4.2%	5.0%

$35k–$50k 84.6%

$50k–$75k 15.4%

Range	% of households
$35k–$50k	84.6%
$50k–$75k	15.4%
Median income	$43,977

Housing

Home values

Housing overview

Metric	Value
Median home value	$0
Median rent / month	$981
Owner occupied	0.0%
Renter occupied	100.0%
Vacant	0.0%
Single-family detached	0.0%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	5.2
Avg household size (owned)	0.00

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	0.0%
1990–1999	0.0%
1980–1989	0.0%
1970–1979	0.0%
1960–1969	61.5%
1950–1959	15.4%
1940–1949	23.1%
1939 or earlier	0.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.0%
2 bedrooms	0.0%
3 bedrooms	100.0%
4 bedrooms	0.0%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	23.1%
2 vehicles	76.9%
3 or more	0.0%

Heating fuel

Fuel type	%
Utility gas	38.5%
Electricity	61.5%

Households & families

Household type	Count	%
Married-couple family	8	15.4%
Cohabiting couple	0	0.0%
Male householder, no spouse	12	23.1%
Female householder, no spouse	32	61.5%
Households with children under 18	32	61.5%
Households with seniors (65+)	8	15.4%
Average household size	2.38

Marital status

Status	Male	Female
Never married	0.0%	80.0%
Married	36.8%	20.0%
Separated	0.0%	0.0%
Widowed	63.2%	0.0%
Divorced	0.0%	0.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.0%

HS graduate 45.8%

Some college, no degree 54.2%

Associate's degree 0.0%

Bachelor's degree 0.0%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	100.0%
Bachelor's or higher	0.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	65	100.0%
Elementary school	0	0.0%
High school	0	0.0%
College / grad school	0	0.0%

Employment

Industry of employment

Education & healthcare 67.8%

Construction 20.3%

Other services 11.9%

Occupation

Category	%
Management, business & arts	67.8%
Service	0.0%
Sales & office	11.9%
Natural resources & construction	20.3%
Production & transportation	0.0%

Employment type

Type	%
Private sector	100.0%
Government	0.0%
Self-employed	0.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	100.0%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	0.0%
Other means	0.0%
Avg commute (minutes)	0.0

Poverty

All people 0.0%

Under 18 years 0.0%

18 and over 0.0%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	15.4%
Retirement income	0.0%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
Obesity	41.9%
High blood pressure	35.9%
High cholesterol	34.1%
Diabetes	13.6%
Heart disease	7.0%
Stroke	3.7%
Asthma	9.9%
Arthritis	25.4%
Kidney disease	3.2%
Pulmonary disease	9.5%
Cancer	5.5%

Behavior / access	%
Smoking	27.1%
Binge drinking	20.7%
No physical activity	33.9%
Less than 7 hrs sleep	36.3%
Depression	18.8%
Fair or poor health	19.0%
Poor mental health	15.9%
Poor physical health	13.1%
No health insurance	13.6%
Visited doctor (checkup)	75.2%
Visited dentist	55.9%
Cholesterol screening	84.0%
Teeth loss	20.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	7	11.9%

Disability	%
Any disability	52.4%
Under 18	100.0%
18–64 years	0.0%
65 and over	0.0%

Health insurance coverage

Type	%
Private insurance	35.5%
Public insurance	64.5%
No insurance	0.0%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	124	100.0%
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)	124	100.0%
Born in same state	124	100.0%
Born in different state	109	87.9%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
French	97	78.2%
Italian	44	35.5%

Ancestry	Count	%
Polish	8	6.5%

Technology access

Metric	% of households
Computer access	41.9%
Internet access	100.0%

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

Frequently asked questions about ZIP code 51111

What city is ZIP code 51111 in?

ZIP code 51111 is primarily assigned to Sioux City, Iowa.

What county is ZIP code 51111 in?

ZIP code 51111 falls within Woodbury County, Iowa.

Is ZIP code 51111 family-oriented?

52% of residents in ZIP code 51111 are under 18, reflecting a younger, family-oriented community.

Does ZIP code 51111 have a large veteran population?

12% of civilians in ZIP code 51111 are veterans, above the national average of ~7%.

What is the median household income in ZIP code 51111?

The median household income in ZIP code 51111 is $43,977, below the national median of ~$75,000.

What is the population of ZIP code 51111?

ZIP code 51111 has an estimated population of 124 residents, with a density of 20 people per square mile.

What timezone is ZIP code 51111 in?

ZIP code 51111 observes the CST timezone.