51003 ZIP Code, Alton, IA
51003 is a ZIP code in Alton, Iowa in Sioux County. It covers 54 square miles of land. The closest ZIP codes are 51041, 51022 and 51238. 1,938 people live here in 730 households. It is rural, with fewer than 100 people per square mile, and most homes are owner-occupied (87%). Median household income is $101,250, above the Iowa median of $75,059.
Quick facts
- Mailing city: Alton, IA
- County: Sioux County
- Land area: 54 sq mi
- Population: 1,938
- Median household income: $101,250
Key figures
| Measure | Value |
|---|---|
| Residents | 1,938 |
| Households | 730 |
| Median household income | $101,250 |
| Income per person | $44,417 |
| Median age | 37.1 |
| Homeowners | 87.1% |
| Median home value | $232,700 |
| Median rent | $813 |
| Bachelor's degree or higher | 29.2% |
| Average commute (minutes) | 21.1 |
| Households with kids under 18 | 34.8% |
| Moved in the past year | 12.6% |
| Below the poverty line | 2.0% |
| Broadband internet | 90.1% |
| Speak a non-English language at home | 4.7% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.5% |
| $10–15K | 1.4% |
| $15–25K | 1.9% |
| $25–35K | 7.9% |
| $35–50K | 9.3% |
| $50–75K | 10.3% |
| $75–100K | 16.3% |
| $100–150K | 25.6% |
| $150–200K | 13.7% |
| $200K+ | 12.1% |
Age
| % of all residents | Value |
|---|---|
| <10 | 16.3% |
| 10–19 | 11.9% |
| 20–24 | 11.3% |
| 25–34 | 8.0% |
| 35–44 | 14.9% |
| 45–54 | 10.5% |
| 55–64 | 14.3% |
| 65–74 | 7.2% |
| 75+ | 5.4% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 48.4% |
| Owned outright | 32.4% |
| Rented | 11.9% |
| Vacant | 7.3% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 84.5% |
| Townhome | 3.4% |
| 2–4 units | 6.1% |
| 5–19 units | 2.4% |
| 20+ units | 0.0% |
| Mobile / other | 3.6% |
Businesses in 51003
44 business establishments with 175 employees (ZIP Codes Business Patterns 2023).
- Construction: 9
- Transportation and Warehousing: 7
- Other Services (except Public Administration): 6
- Retail Trade: 5
- Wholesale Trade: 4
- Manufacturing: 3
EDDM carrier routes
See every USPS carrier route in 51003 with residential and business mailbox counts on the route map. Open the EDDM route map.
Nearby ZIP codes
- 51041 — Orange City city, IA (5.2 mi)
- 51022 — Granville city, IA (7.1 mi)
- 51238 — Hospers city, IA (7.5 mi)
- 51036 — Maurice city, IA (10.4 mi)
- 51045 — Oyens city, IA (12.3 mi)
- 51250 — Sioux Center city, IA (13.1 mi)
- 51050 — Remsen city, IA (13.2 mi)
- 51234 — Boyden city, IA (14.1 mi)
Areas that include 51003
- Alton, IA ZIP codes — 1 ZIP code
- Sioux County ZIP codes — 16 ZIP codes
- Iowa ZIP code data
Where it ranks
- No. 1 of 11: highest median household income in Sioux County
- No. 5 of 11: highest median home value in Sioux County
- No. 3 of 11: highest share of owner-occupied homes in Sioux County
- No. 3 of 11: highest share of residents who moved in during the past year in Sioux County
- No. 3 of 11: highest median age in Sioux County
- No. 3 of 11: fastest population growth in Sioux County
Mail every home in 51003
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) 51003, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 51003 in?
- 51003 is a Alton, IA mailing address. By land area, 4% lies inside Alton; the rest is outside any Census-defined city or community.
- What county is 51003 in?
- 51003 is in Sioux County.
- What is the population of 51003?
- About 1,938 people (±324), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 1,719.
- What is the median household income in 51003?
- $101,250 (±$13,167), 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 51003?
- EDDM2GO's stored route library does not include 51003 yet. The EDDM route map loads its carrier routes and mailbox counts when you search the ZIP code.
- What ZIP codes are near 51003?
- The closest, measured center to center: 51041 (5.2 mi, Orange City), 51022 (7.1 mi, Granville), 51238 (7.5 mi, Hospers), 51036 (10.4 mi, Maurice), 51045 (12.3 mi, Oyens) and 51250 (13.1 mi, Sioux Center).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.