51101 ZIP Code, Sioux City, IA
51101 is a ZIP code in Sioux City, Iowa in Woodbury County. It covers 1.2 square miles of land. The closest ZIP codes are 51105, 51104 and 51103. 1,031 people live here in 640 households. With about 857 people per square mile it is lightly settled, and most households rent (3% own). Median household income is $15,300, well below the Iowa median of $75,059; 34% of residents moved in during the past year.
Quick facts
- Mailing city: Sioux City, IA
- County: Woodbury County
- Land area: 1.2 sq mi
- Population: 1,031
- Median household income: $15,300
Key figures
| Measure | Value |
|---|---|
| Residents | 1,031 |
| Households | 640 |
| Median household income | $15,300 |
| Income per person | $21,580 |
| Median age | 40.8 |
| Homeowners | 3.4% |
| Median home value | not published |
| Median rent | $708 |
| Bachelor's degree or higher | 10.9% |
| Average commute (minutes) | 10.8 |
| Households with kids under 18 | 17.2% |
| Moved in the past year | 34.2% |
| Below the poverty line | 48.1% |
| Broadband internet | 75.5% |
| Speak a non-English language at home | 13.5% |
Household income
| % of households | Value |
|---|---|
| <$10K | 36.4% |
| $10–15K | 13.1% |
| $15–25K | 11.6% |
| $25–35K | 13.0% |
| $35–50K | 4.2% |
| $50–75K | 8.4% |
| $75–100K | 10.2% |
| $100–150K | 1.9% |
| $150–200K | 1.3% |
| $200K+ | 0.0% |
Age
| % of all residents | Value |
|---|---|
| <10 | 1.9% |
| 10–19 | 9.1% |
| 20–24 | 8.5% |
| 25–34 | 19.4% |
| 35–44 | 19.4% |
| 45–54 | 12.2% |
| 55–64 | 12.2% |
| 65–74 | 9.3% |
| 75+ | 7.8% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 1.0% |
| Owned outright | 1.8% |
| Rented | 78.4% |
| Vacant | 18.8% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 1.5% |
| Townhome | 0.0% |
| 2–4 units | 7.3% |
| 5–19 units | 27.9% |
| 20+ units | 63.3% |
| Mobile / other | 0.0% |
Businesses in 51101
413 business establishments with 9,223 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 71
- Accommodation and Food Services: 49
- Health Care and Social Assistance: 41
- Other Services (except Public Administration): 39
- Retail Trade: 35
- Finance and Insurance: 35
- Wholesale Trade: 30
- Real Estate and Rental and Leasing: 28
EDDM carrier routes
See every USPS carrier route in 51101 with residential and business mailbox counts on the route map. Open the EDDM route map.
Nearby ZIP codes
- 51105 — Sioux City city, IA (1.7 mi)
- 51104 — Sioux City city, IA (2.9 mi)
- 51103 — Sioux City city, IA (3.3 mi)
- 68776 — South Sioux City city, NE (3.5 mi)
- 51106 — Sioux City city, IA (4.6 mi)
- 51111 — Sioux City city, IA (5.2 mi)
- 51108 — Sioux City city, IA (5.4 mi)
- 57049 — North Sioux City city, SD (6.2 mi)
Areas that include 51101
- Sioux City, IA ZIP codes — 8 ZIP codes
- Woodbury County ZIP codes — 26 ZIP codes
- Iowa ZIP code data
Where it ranks
- No. 1 of 16: highest share of residents who moved in during the past year in Woodbury County
- No. 1 of 7: highest share of residents who moved in during the past year in Sioux City, IA
- No. 1 of 7: highest median age in Sioux City, IA
Mail every home in 51101
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 51101, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 51101 in?
- 51101 is a Sioux City, IA mailing address. By land area, 100% lies inside Sioux City.
- What county is 51101 in?
- 51101 is in Woodbury County.
- What is the population of 51101?
- About 1,031 people (±256), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 1,146.
- What is the median household income in 51101?
- $15,300 (±$11,482), compared with $75,059 for Iowa as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 51101?
- EDDM2GO's stored route library does not include 51101 yet. The EDDM route map loads its carrier routes and mailbox counts when you search the ZIP code.
- What ZIP codes are near 51101?
- The closest, measured center to center: 51105 (1.7 mi, Sioux City), 51104 (2.9 mi, Sioux City), 51103 (3.3 mi, Sioux City), 68776 (3.5 mi, South Sioux City), 51106 (4.6 mi, Sioux City) and 51111 (5.2 mi, Sioux City).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.