51109 ZIP Code, Sioux City, IA
51109 is a ZIP code in Sioux City, Iowa — mostly in Plymouth County (90% of its land), with smaller parts in Woodbury County. It covers 18 square miles of land. The closest ZIP codes are 57038, 51104 and 51103. 3,606 people live here in 1,447 households. With about 205 people per square mile it is lightly settled, and most homes are owner-occupied (87%). Median household income is $79,034, close to the Iowa median of $75,059.
Quick facts
- Mailing city: Sioux City, IA
- County: Plymouth County
- Land area: 18 sq mi
- Population: 3,606
- Median household income: $79,034
Key figures
| Measure | Value |
|---|---|
| Residents | 3,606 |
| Households | 1,447 |
| Median household income | $79,034 |
| Income per person | $37,934 |
| Median age | 39.4 |
| Homeowners | 87.0% |
| Median home value | $130,900 |
| Median rent | $627 |
| Bachelor's degree or higher | 3.4% |
| Average commute (minutes) | 16.4 |
| Households with kids under 18 | 29.0% |
| Moved in the past year | 10.0% |
| Below the poverty line | 16.1% |
| Broadband internet | 88.5% |
| Speak a non-English language at home | 18.1% |
Household income
| % of households | Value |
|---|---|
| <$10K | 0.7% |
| $10–15K | 3.2% |
| $15–25K | 5.5% |
| $25–35K | 7.3% |
| $35–50K | 20.1% |
| $50–75K | 12.2% |
| $75–100K | 21.3% |
| $100–150K | 17.9% |
| $150–200K | 8.5% |
| $200K+ | 3.2% |
Age
| % of all residents | Value |
|---|---|
| <10 | 11.5% |
| 10–19 | 14.4% |
| 20–24 | 10.9% |
| 25–34 | 11.0% |
| 35–44 | 10.2% |
| 45–54 | 13.4% |
| 55–64 | 10.8% |
| 65–74 | 10.3% |
| 75+ | 7.4% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 44.6% |
| Owned outright | 40.0% |
| Rented | 12.6% |
| Vacant | 2.8% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 85.4% |
| Townhome | 4.5% |
| 2–4 units | 4.9% |
| 5–19 units | 4.3% |
| 20+ units | 0.0% |
| Mobile / other | 0.9% |
Businesses in 51109
57 business establishments with 349 employees (ZIP Codes Business Patterns 2023).
- Retail Trade: 16
- Other Services (except Public Administration): 11
- Accommodation and Food Services: 6
- Construction: 5
- Health Care and Social Assistance: 5
- Arts, Entertainment, and Recreation: 3
EDDM carrier routes
See every USPS carrier route in 51109 with residential and business mailbox counts on the route map. Open the EDDM route map.
Nearby ZIP codes
- 57038 — Jefferson city, SD (5.9 mi)
- 51104 — Sioux City city, IA (6.2 mi)
- 51103 — Sioux City city, IA (6.3 mi)
- 57049 — North Sioux City city, SD (6.3 mi)
- 51108 — Sioux City city, IA (6.7 mi)
- 51062 — Westfield city, IA (6.9 mi)
- 51105 — Sioux City city, IA (8.8 mi)
- 51101 — Sioux City city, IA (8.9 mi)
Areas that include 51109
- Sioux City, IA ZIP codes — 8 ZIP codes
- Plymouth County ZIP codes — 13 ZIP codes
- Woodbury County ZIP codes — 26 ZIP codes
- Iowa ZIP code data
Where it ranks
- No. 2 of 9: highest share of owner-occupied homes in Plymouth County
- No. 3 of 9: highest share of residents who moved in during the past year in Plymouth County
- No. 4 of 9: lowest median age in Plymouth County
- No. 3 of 9: fastest population growth in Plymouth County
- No. 2 of 7: highest median household income in Sioux City, IA
- No. 5 of 6: highest median home value in Sioux City, IA
- No. 1 of 7: highest share of owner-occupied homes in Sioux City, IA
- No. 3 of 7: highest share of residents who moved in during the past year in Sioux City, IA
- No. 2 of 7: highest median age in Sioux City, IA
- No. 2 of 6: fastest population growth in Sioux City, IA
Mail every home in 51109
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) 51109, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 51109 in?
- 51109 is a Sioux City, IA mailing address. By land area, 10% lies inside Sioux City; the rest is outside any Census-defined city or community.
- What county is 51109 in?
- 51109 is mostly in Plymouth County (90% of its land), with smaller parts in Woodbury County.
- What is the population of 51109?
- About 3,606 people (±587), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 3,109.
- What is the median household income in 51109?
- $79,034 (±$20,375), 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 51109?
- EDDM2GO's stored route library does not include 51109 yet. The EDDM route map loads its carrier routes and mailbox counts when you search the ZIP code.
- What ZIP codes are near 51109?
- The closest, measured center to center: 57038 (5.9 mi, Jefferson), 51104 (6.2 mi, Sioux City), 51103 (6.3 mi, Sioux City), 57049 (6.3 mi, North Sioux City), 51108 (6.7 mi, Sioux City) and 51062 (6.9 mi, Westfield).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.