Unshakable ZIP Data 21757 | Keymar, MD Housing Market
Keymar · Frederick County · Washington-Arlington-Alexandria, DC-VA-MD-WV metro · Maryland · Data updated June 19, 2026
The median sale price in ZIP 21757, Keymar, Maryland is $429,822 at $267 per square foot. 10 single-family homes sold in the latest period, up 414.8 percent from a year earlier. Homes sit a median of 72 days on market with 1.6 months of supply. Sellers are getting 99.3 percent of list price and 10.0 percent of homes sold above asking.
Buyer leverage market. Negotiate hard.
Value anchors
| Metric | Value | Year over year |
|---|---|---|
| Average single-family value | $462,914 | |
| Average price per sq ft | $288 | |
| Median sale price | $429,822 | |
| Median sale price per sq ft | $267 | |
| Median home size | 1,610 sq ft | |
| Median new listing price | $384,215 | +6.7% |
| National size rank | 16,454 |
Sales activity
| Metric | Value | Year over year |
|---|---|---|
| Homes sold | 10 | +414.8% |
| Median days on market | 72 days | |
| Months of supply | 1.6 months | |
| New listings | 10 | +69.2% |
| Active listings | 17 | +91.3% |
| Pending sales | 10 | +153.4% |
Pricing power
| Metric | Value | Year over year |
|---|---|---|
| Average sale-to-list ratio | 99.3% | -5.1 pts |
| Share sold above list | 10.0% | -90.0 pts |
Bedroom value anchors
Average values by bedroom count. Value anchors for orientation, not appraisals.
3-bedroom
$434,870
These figures describe the single-family market for Keymar, Maryland ZIP 21757. They are market context, not a substitute for sold comps or a formal appraisal.