Zip Code 51104
Sioux City, Iowa — Woodbury County
📍 ZIP code 51104 is in Sioux City, Woodbury County, Iowa.
ZIP code 51104 is located in Sioux City, Woodbury County, Iowa. It is a zip code in the Central (CST/CDT) Time Zone with an estimated population of 22,792. The area code for ZIP code 51104 is 319.
Quick Answer
Zip code 51104 is in Sioux City, Iowa (Woodbury County). It has a population of 22,792, median household income of $74,984, and median home value of $193,000.
Population
22,792
Income
$74,984
Home Value
$193,000
Climate
86°F / 9°F
About Zip Code 51104
Zip code 51104 is located in Sioux City, Iowa, within Woodbury County. Home to approximately 22,792 residents, this area sits at an elevation of 1266 ft and falls within the Central (CST/CDT) timezone. The local area code is 319.
The median household income is $74,984 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $193,000, and the cost of living index is 78 (22% below the national average of 100).
Summers average a high of 86°F while winters drop to 9°F. The area receives about 30 in of rain and 18 in of snow annually. The zip code covers 7.8 square miles of land area.
Key Statistics
22,792
$74,984
$193,000
Central (CST/CDT)
319
1266 ft
7.8 sq mi
37
9,119
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Compare With Nearby Zip Codes
| Metric | 51104 | 51103 | 51101 | 51105 | 51108 | 51109 |
|---|---|---|---|---|---|---|
| City | Sioux City, IA | Sioux City, IA | Sioux City, IA | Sioux City, IA | Sioux City, IA | Sioux City, IA |
| Population | 22,792 | 17,145 | 1,077 | 10,726 | 5,637 | 3,731 |
| Median Income | $74,984 | $57,212 | $18,103 | $46,940 | $78,333 | $70,750 |
| Home Value | $193,000 | $124,400 | $219,600 | $84,700 | $166,600 | $120,400 |
| Cost of Living | 78 | 60 | 60 | 60 | 71 | 66 |
| Median Age | 37 | 36.8 | 33.8 | 30.3 | 44.2 | 41.2 |
Cost of Living
100 = National Average. Sioux City's cost of living is 22% below the national average.
vs. State Avg
Below
Affordability
Very Affordable
Income-to-Home
2.6x
Demographics
Zip code 51104 has a population of 22,792 people with a median age of 37. There are 9,119 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Sioux City (51104) population trend from 2010 to 2024
↓ -11.6%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
86°F
9°F
30 in
18 in
Sioux City experiences warm summers with average highs around 86°F. Winters are cold with lows averaging 9°F. The area receives about 18 in of snow per year.
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Housing & Economy
Median Home Value
$193,000
Median Household Income
$74,984
With 9,119 housing units across 7.8 square miles, 51104 has a housing density of 1,169 units per square mile. The home price-to-income ratio is 2.6x.
Location & Geography
Latitude
42.5362°
Longitude
-96.4047°
Land Area
7.8 sq mi
Water Area
0 sq mi
Nearby Zip Codes
Zip codes closest to 51104 (Sioux City, IA) with distances:
All Zip Codes in Sioux City, IA
Other zip codes serving Sioux City:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 51104's $74,984. A way to compare Sioux City to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 51104 (Sioux City, IA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Sioux City, Iowa?
Sioux City, Iowa uses zip code 51104 along with 7 other zip codes.
What county is zip code 51104 in?
Zip code 51104 is located in Woodbury County, Iowa.
What is the population of zip code 51104?
The population of zip code 51104 is 22,792 with a median age of 37.
Is 51104 in Sioux City, Iowa?
Yes, zip code 51104 is in Sioux City, Woodbury County, Iowa. The area code is 319.
Frequently Asked Questions
What city is zip code 51104 in?
Zip code 51104 is in Sioux City, Iowa. It is part of Woodbury County and uses the Central (CST/CDT) timezone.
What is zip code 51104?
Zip code 51104 is a U.S. postal code in Sioux City, Iowa (Woodbury County). It has a population of 22,792 and covers 7.8 square miles.
What is the population of zip code 51104?
The population of zip code 51104 (Sioux City, IA) is 22,792 with a median age of 37. There are approximately 9,119 housing units in this area.
What is the median income in zip code 51104?
The median household income in zip code 51104 (Sioux City, IA) is $74,984 per year. The cost of living index is 78 (100 = national average).
What is the average home price in zip code 51104?
The median home value in zip code 51104 (Sioux City, IA) is $193,000. The cost of living index is 78 compared to the national average of 100.
What county is zip code 51104 in?
Zip code 51104 is located in Woodbury County, Iowa. The primary city is Sioux City.
What is the area code for zip code 51104?
Zip code 51104 in Sioux City, IA uses area code 319. It is located in the Central (CST/CDT) timezone.
Is zip code 51104 a good place to live?
Zip code 51104 (Sioux City, IA) has a cost of living index of 78 (100 = national average), a median household income of $74,984, and median home values of $193,000. The median age is 37. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 51104?
The cost of living index for zip code 51104 (Sioux City, IA) is 78, where 100 represents the national average. This area is below the national average. Median home value: $193,000.
What schools serve zip code 51104?
Zip code 51104 in Sioux City, Iowa is served by the local school district of Woodbury County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.