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ZIP Code 51003
Alton, IA, Sioux County
Population
1,938
Land area
54.4sq mi
People per sq mi
36
City
Alton
ZIP 51003 and nearby ZIP codes
ZIP 51003 at a glance
- ZIP 51003 (Alton) is 38% less dense than Iowa as a whole.
- Households here earn a median of $101,250 a year, 35% more than the Iowa figure of $75,059.
- A typical owner-occupied home is valued at $232,700 (12% above Iowa) and median rent is $813 a month.
Local data for ZIP 51003
Counts from official public data
Housing and community stats
ZIP 51003, American Community Survey 2020-2024
Median household income
$101,250
Poverty rate
2.0%
Median home value
$232,700
Prices +15.8% in a year
Median rent
$813/mo
Homeownership
87.1%
Bachelor's or higher
29.2%
Median age
37.1
Average commute
21.1 min
Economy and federal money
Businesses, pandemic loans and political donations
Business establishments
44
ZIP Business Patterns 2023
Employees
175
$7.9M annual payroll
PPP loans
$4.5M
267 loans
Campaign donations
$1,348
0% D, 4% R, 2026 cycle
Environment and hazard risk
ZIP 51003, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: hail
Storm events since 1996
958
Countywide, mostly hail
Flood insurance policies
151
1.2% of homes, county
July high / Jan low
85° / 9°F
29.8 inches of rain a year
Health statistics
Share of adults in ZIP 51003, CDC PLACES estimates
Obesity
34.1%
U.S. 33.3% +0.8 pts
Diabetes
9.8%
U.S. 12.1% -2.3 pts
Smoking
13.4%
U.S. 12.8% +0.6 pts
Uninsured (18-64)
6.1%
U.S. 11.1% -5.0 pts
Frequently asked questions
- What city is ZIP code 51003?
- ZIP code 51003 is in Alton, IA (Sioux County).
- What county is ZIP code 51003 in?
- ZIP code 51003 is mostly in Sioux County, Iowa.
- How many people live in ZIP code 51003?
- About 1,938 people live in the 51003 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.
Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.