Alton, IA ZIP Codes
One ZIP code serves Alton, Iowa: 51003. Together they are home to 1,938 residents in 730 households. That is more than the 1,459 people counted inside Alton city limits, because these ZIP codes reach past its boundary.
Alton city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 1,459 |
| Households | 592 |
| Median household income | $98,036 |
| Median home value | $218,900 |
| Median age | 38.1 |
| Median rent | $813 |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 1,938 |
| Households (sum of ZIP codes) | 730 |
| Median household income, range across ZIP codes | $101,250 (51003) to $101,250 (51003) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $101,250 |
| Homeowners | 87.1% |
| Households with kids under 18 | 34.8% |
| Moved in the past year | 12.6% |
| Carrier routes in EDDM2GO's route library | not loaded yet |
Every ZIP code in Alton
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 51003 | Alton | 1,938 | 730 | $101,250 | $232,700 | 87.1% | 34.8% | 12.6% | — | — | 4% of its land; mailing city |
A ZIP code is listed for Alton when at least 10% of its land lies inside Alton city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Alton. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Alton.
Counties
- Sioux County — 16 ZIP codes
Price a mailing to Alton ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Alton, IA?
- 51003. A ZIP code is listed for Alton when at least 10% of its land lies inside Alton city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Alton.
- What is the population of Alton, IA?
- The Census Bureau counts 1,459 residents inside Alton city limits (ACS 2020–2024). The 1 ZIP code that serve Alton hold 1,938 residents in all.
- What is the median household income in Alton, IA?
- $98,036 inside Alton city limits, per the Census Bureau. Across its ZIP codes the medians run from $101,250 to $101,250.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.