51104 ZIP Code — Sioux City, IA
Woodbury County, Iowa
ZIP code 51104 is located in Sioux City, Iowa, within Woodbury County. It covers approximately 7.48 square miles and serves a population of 22,759 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.
About ZIP code 51104
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 $179,500. Owner-occupancy sits near the national average at 66%.
Median household income is $74,734.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 17 minutes is near the national average.
Educational attainment is near the national average, with 31% of residents holding a bachelor's degree or higher.
22,759
population
7.48
sq mi land
Standard
ZIP type
Central (CT)
timezone
51104 ZIP code map
Cities in ZIP code 51104
Below are the cities the US Postal Service accepts for ZIP code 51104. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Sioux City | Preferred |
Nearby ZIP codes
51105 Sioux City (2.2 mi)
51103 Sioux City (2.2 mi)
51101 Sioux City (3 mi)
51108 Sioux City (3.2 mi)
51109 Sioux City (4.3 mi)
68776 South Sioux City (4.9 mi)
57049 North Sioux City (5.3 mi)
51106 Sioux City (6.6 mi)
51111 Sioux City (8.4 mi)
51024 Hinton (8.8 mi)
68731 Dakota City (8.9 mi)
57038 Jefferson (10.4 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 22,759 |
| Population density | 3,043 / sq mi |
| State FIPS | 19 |
| County FIPS | 193 |
| Geography | |
|---|---|
| Land area | 7.48 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 42.5350 |
| Longitude | -96.4024 |
| 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 | 37.8% | 40.6% | 40.1% |
| $50k – $100k | 31.8% | 33.9% | 33.4% |
| $100k – $200k | 24.5% | 21.3% | 21.5% |
| Over $200k | 5.9% | 4.2% | 5.0% |
Demographics & statistics
22,759
Population
3,043
People per sq mi
34.8
Median age
$74,734
Median household income
$34,357
Per capita income
$179,500
Median home value
$949
Median monthly rent
65.6%
Home ownership
9.3%
Poverty rate
4.5%
Unemployment
6,015
Housing units
30.7%
Bachelor's or higher
Age distribution
Male
Female
804
Under 5
767
679
5–9
649
916
10–14
875
846
15–19
809
986
20–24
941
1,634
25–34
1,560
1,615
35–44
1,543
1,120
45–54
1,069
649
55–59
620
671
60–64
641
1,033
65–74
986
504
75–84
481
185
85+
176
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 5,746 | 25.2% |
| 18 and over | 17,013 | 74.8% |
| 65 and over | 3,365 | 14.8% |
| Median age | 34.8 years | |
Race & ethnicity
White
66.7%
Two or more races
11%
Hispanic or Latino
9.9%
Black or African American
4.5%
Asian
3.5%
Other race
2.4%
American Indian / Alaska Native
1.7%
Native Hawaiian / Pacific Islander
0.4%
| Group | Count | % |
|---|---|---|
| White | 16,835 | 66.7% |
| Two or more races | 2,778 | 11% |
| Hispanic or Latino | 2,497 | 9.9% |
| Black or African American | 1,134 | 4.5% |
| Asian | 889 | 3.5% |
| Other race | 605 | 2.4% |
| American Indian / Alaska Native | 425 | 1.7% |
| Native Hawaiian / Pacific Islander | 93 | 0.4% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 37.8% | 40.6% | 40.1% |
| $50k – $100k | 31.8% | 33.9% | 33.4% |
| $100k – $200k | 24.5% | 21.3% | 21.5% |
| Over $200k | 5.9% | 4.2% | 5.0% |
Under $10k
5.8%
$10k–$15k
1.0%
$15k–$25k
6.3%
$25k–$35k
8.1%
$35k–$50k
13.3%
$50k–$75k
15.6%
$75k–$100k
14.7%
$100k–$150k
17.9%
$150k–$200k
12.2%
$200k+
5.1%
| Range | % of households |
|---|---|
| Under $10k | 5.8% |
| $10k–$15k | 1.0% |
| $15k–$25k | 6.3% |
| $25k–$35k | 8.1% |
| $35k–$50k | 13.3% |
| $50k–$75k | 15.6% |
| $75k–$100k | 14.7% |
| $100k–$150k | 17.9% |
| $150k–$200k | 12.2% |
| $200k+ | 5.1% |
| Median income | $74,734 |
Housing
Home values
Under $50k
2.3%
$50k–$100k
8.0%
$100k–$150k
25.8%
$150k–$200k
24.6%
$200k–$300k
28.0%
$300k–$500k
9.8%
$500k–$1M
1.2%
$1M+
0.3%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $179,500 |
| Median rent / month | $949 |
| Owner occupied | 65.6% |
| Renter occupied | 34.4% |
| Vacant | 6.0% |
| Single-family detached | 72.1% |
| Large apartment buildings | 12.0% |
| Mobile homes | 0.8% |
| Median rooms | 5.9 |
| Avg household size (owned) | 2.88 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.3% |
| 2010–2019 | 2.1% |
| 2000–2009 | 1.5% |
| 1990–1999 | 9.8% |
| 1980–1989 | 6.9% |
| 1970–1979 | 15.5% |
| 1960–1969 | 10.4% |
| 1950–1959 | 18.4% |
| 1940–1949 | 8.5% |
| 1939 or earlier | 26.5% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 1.4% |
| 1 bedroom | 14.1% |
| 2 bedrooms | 28.1% |
| 3 bedrooms | 36.4% |
| 4 bedrooms | 17.4% |
| 5+ bedrooms | 2.5% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 4.8% |
| 1 vehicle | 32.2% |
| 2 vehicles | 35.0% |
| 3 or more | 28.0% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 63.4% |
| Electricity | 33.9% |
| Propane / LP gas | 1.6% |
| No fuel used | 0.9% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 3,918 | 46.9% |
| Cohabiting couple | 787 | 9.4% |
| Male householder, no spouse | 1,453 | 17.4% |
| Female householder, no spouse | 2,203 | 26.3% |
| Households with children under 18 | 2,951 | 35.3% |
| Households with seniors (65+) | 2,175 | 26.0% |
| Average household size | 2.64 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 42.2% | 32.5% |
| Married | 47.0% | 46.8% |
| Separated | 1.2% | 2.1% |
| Widowed | 1.1% | 7.6% |
| Divorced | 8.5% | 11.0% |
Education
Less than 9th grade
5.8%
Some HS, no diploma
5.0%
HS graduate
26.9%
Some college, no degree
20.7%
Associate's degree
10.9%
Bachelor's degree
20.9%
Graduate / professional
9.8%
| Metric | % |
|---|---|
| HS diploma or higher | 89.1% |
| Bachelor's or higher | 30.7% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 343 | 6.2% |
| Kindergarten | 214 | 3.9% |
| Elementary school | 2,518 | 45.4% |
| High school | 1,299 | 23.4% |
| College / grad school | 1,176 | 21.2% |
Employment
Industry of employment
Education & healthcare
24.7%
Manufacturing
14.9%
Retail trade
12.3%
Arts, food & hospitality
9.4%
Construction
8.0%
Transportation & utilities
5.8%
Other services
5.8%
Professional & management
5.7%
Finance & real estate
4.5%
Public administration
3.5%
Wholesale trade
2.4%
Agriculture & mining
1.8%
Information
1.3%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 37.7% |
| Service | 14.8% |
| Sales & office | 19.7% |
| Natural resources & construction | 8.9% |
| Production & transportation | 19.0% |
Employment type
| Type | % |
|---|---|
| Private sector | 85.0% |
| Government | 12.0% |
| Self-employed | 3.0% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 83.2% |
| Carpool | 11.1% |
| Public transit | 0.7% |
| Walk | 0.6% |
| Work from home | 3.9% |
| Other means | 0.6% |
| Avg commute (minutes) | 17.4 |
Poverty
All people
9.3%
Under 18 years
12.1%
18 and over
8.3%
Married-couple families
2.2%
Female-led households
30.8%
Income support
| Source | % of households |
|---|---|
| Social Security | 27.5% |
| Retirement income | 20.8% |
| Supplemental Security | 5.2% |
| Cash public assistance | 1.3% |
| Food stamps / SNAP | 9.9% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 35.8% |
| High blood pressure | 30.5% |
| High cholesterol | 31.6% |
| Diabetes | 10.3% |
| Heart disease | 5.8% |
| Stroke | 2.8% |
| Asthma | 9.2% |
| Arthritis | 22.1% |
| Kidney disease | 2.7% |
| Pulmonary disease | 6.0% |
| Cancer | 6.3% |
| Behavior / access | % |
|---|---|
| Smoking | 16.4% |
| Binge drinking | 20.8% |
| No physical activity | 26.0% |
| Less than 7 hrs sleep | 31.8% |
| Depression | 17.2% |
| Fair or poor health | 12.9% |
| Poor mental health | 13.9% |
| Poor physical health | 9.2% |
| No health insurance | 11.7% |
| Visited doctor (checkup) | 76.4% |
| Visited dentist | 68.4% |
| Cholesterol screening | 86.8% |
| Teeth loss | 13.2% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 939 | 5.5% |
| Disability | % |
|---|---|
| Any disability | 9.5% |
| Under 18 | 2.2% |
| 18–64 years | 9.0% |
| 65 and over | 24.5% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 67.2% |
| Public insurance | 37.3% |
| No insurance | 6.6% |
| Uninsured under 19 | 2.4% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 21,188 | 93.1% |
| Spanish | 1,948 | 9.2% |
| Other Indo-European | 1,081 | 5.1% |
| Asian & Pacific Islander | 235 | 1.1% |
| Other languages | 454 | 2.1% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 20,255 | 89.0% |
| Born in same state | 20,162 | 88.6% |
| Born in different state | 14,549 | 63.9% |
| Foreign born | 93 | 0.4% |
| Naturalized citizen | 2,504 | 11.0% |
| Not a US citizen | 1,491 | 59.5% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 3,242 | 14.2% |
| French | 1,503 | 6.6% |
| Arab | 966 | 4.2% |
| Polish | 814 | 3.6% |
| Ancestry | Count | % |
|---|---|---|
| English | 583 | 2.6% |
| Dutch | 295 | 1.3% |
| German | 57 | 0.3% |
| Irish | 31 | 0.1% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 36.7% |
| Internet access | 94.4% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 51104
What city is ZIP code 51104 in?
ZIP code 51104 is primarily assigned to Sioux City, Iowa.
What county is ZIP code 51104 in?
ZIP code 51104 falls within Woodbury County, Iowa.
What is the typical home value in ZIP code 51104?
The median home value in ZIP code 51104 is $179,500.
What is the population of ZIP code 51104?
ZIP code 51104 has an estimated population of 22,759 residents, with a density of 3,045 people per square mile.
What is the median household income in ZIP code 51104?
The median household income in ZIP code 51104 is $74,734, below the national median of ~$75,000.
What timezone is ZIP code 51104 in?
ZIP code 51104 observes the CST timezone.