Unshakable ZIP Data 51003 | Alton, IA Housing Market
Alton · Sioux County · Iowa · Data updated June 19, 2026
The median sale price in ZIP 51003, Alton, Iowa is $315,906 at $138 per square foot. 7 single-family homes sold in the latest period, up 44.1 percent from a year earlier. Homes sit a median of 59 days on market with 0.5 months of supply. Sellers are getting 97.0 percent of list price and 0.0 percent of homes sold above asking.
Balanced market.
Value anchors
| Metric | Value | Year over year |
|---|---|---|
| Average single-family value | $306,472 | |
| Average price per sq ft | $134 | |
| Median sale price | $315,906 | |
| Median sale price per sq ft | $138 | |
| Median home size | 2,285 sq ft | |
| Median new listing price | $181,945 | -47.2% |
| National size rank | 17,677 |
Sales activity
| Metric | Value | Year over year |
|---|---|---|
| Homes sold | 7 | +44.1% |
| Median days on market | 59 days | |
| Months of supply | 0.5 months | |
| New listings | 4 | -49.2% |
| Active listings | 5 | -54.0% |
| Pending sales | 5 | -43.7% |
Pricing power
| Metric | Value | Year over year |
|---|---|---|
| Average sale-to-list ratio | 97.0% | +0.8 pts |
| Share sold above list | 0.0% | 0.0 pts |
These figures describe the single-family market for Alton, Iowa ZIP 51003. They are market context, not a substitute for sold comps or a formal appraisal.