Residential delivery area · Iowa
ZIP Code 51108: Sioux City, IA
ZIP code 51108 uses the postal name Sioux City, Iowa and lies mostly in Plymouth County (53% of its land) with the rest in Woodbury County (Census 2020 ZIP-county file). About 6,000 people live there (Census Bureau, ACS 2020-2024), the 5th most populous of Sioux City's 8 residential ZIP codes. Median household income is $81,205 (Census Bureau, ACS 2020-2024). By Census place, 18% of its land lies in Sioux City; 82% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Sioux City · 8 residential ZIPs
- County
- Plymouth County (53%); Woodbury County (47%)
- Census places
- Sioux City
- Micro area
- Le Mars, IA
- House district
- IA-4 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 46.0 sq mi · 130 people per sq mi
- PO Box ZIPs
- 51102 also use the name Sioux City
Where is ZIP code 51108?
51108 centers on 42.566°, -96.353° and covers 46.0 square miles of land plus 0.1 of water. It borders 7 ZIP codes: 51104, 51105, 51103, 51024, 51109, 51106, 51030.
The map draws ZIP code areas only. For the streets inside 51108, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 51108 compare with the rest of Sioux City?
| Measure | 51108 | In Sioux City | In Plymouth County | In IA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 5,960 | 5th of 8 | 2nd of 14 | 127th of 970 |
| Median household income | $81k | 1st of 5 | 5th of 8 | 162nd of 396 |
| Median home value | $170k | 3rd of 6 | 8th of 9 | 255th of 423 |
Its median household income is higher than in 64% of U.S. residential ZIP codes, and it is denser than 57% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 51108?
The 2020 Census counted 5,967 people in 51108; the ACS, which samples households over 2020-2024, estimates 5,960. Between the 2010 and 2020 censuses its population grew 7.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 5,960±1,238 (90% margin)
- 2020 Census count
- 5,967+7.2% since 2010 (5,566)
- Households
- 2,160
- Median age
- 37.6
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 51108?
Of the 5,960 people the ACS estimates in 51108, 32.3% are under 18 and 16.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (75.8%), then Hispanic or Latino (18.8%).
- Under 1832.3%
- 18 to 6450.8%
- 65 and older16.8%
- White, not Hispanic75.8%
- Hispanic or Latino18.8%
- Other or two or more2.2%
- Black, not Hispanic1.6%
- Asian, not Hispanic1.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 51108 earn?
Median household income is $81,205 (ACS 2020-2024), the 5th highest of the 8 ranked ZIP codes in Plymouth County. It is not measurably different from 2015-2019 ($76,578 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $81,205±$15,585
- Income per person
- $38,642
- Below the poverty line
- 6.5%
- Unemployed (of the labor force)
- 5.6%
- Adults 25+ with a bachelor's degree
- 28.7%
- Adjusted gross income per tax return, 2022
- $83,3742,700 returns; wages 64% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 51108?
FHFA's house price index for 51108, built from repeat sales and appraisals of the same homes, rose 74% from 2015 to 2025 and rose 42% from 2020 to 2025, and moved −0.6% in 2025.
- Median home value (owners' estimate)
- $169,700
- Median gross rent
- $1,350
- Homes owned by their occupants
- 83.3%
- Housing units
- 2,160
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 51108?
132 business establishments had a location in this ZIP code in 2023, 6 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction18
- Retail trade16
- Administrative and support and waste management and remediation services14
- Health care and social assistance12
- Transportation and warehousing10
- Real estate and rental and leasing10
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 51108?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51104 | Sioux City | 23,197 | $75k | 3.4 mi |
| 51105 | Sioux City | 10,415 | $52k | 4.1 mi |
| 51103 | Sioux City | 16,895 | $58k | 5.9 mi |
| 51024 | Hinton | 2,081 | $114k | 6.2 mi |
| 51109 | Sioux City | 3,606 | $79k | 6.7 mi |
| 51106 | Sioux City | 28,592 | $78k | 7.4 mi |
| 51030 | Lawton | 1,468 | $86k | 9.6 mi |
| 51101 | Sioux City | 1,031 | $15k | 5.4 mi (near) |
| 57049 | North Sioux City, SD | 7,962 | $93k | 8.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.