Unshakable ZIP Data 21057 | Glen Arm, MD Housing Market
Glen Arm · Baltimore County · Baltimore-Columbia-Towson, MD metro · Maryland · Data updated June 19, 2026
The median sale price in ZIP 21057, Glen Arm, Maryland is $739,780 at $243 per square foot. 13 single-family homes sold in the latest period, down 4.4 percent from a year earlier. Homes sit a median of 4 days on market with 1.0 months of supply. Sellers are getting 99.4 percent of list price and 53.9 percent of homes sold above asking.
Seller's market. No room for sloppy offers.
Value anchors
| Metric | Value | Year over year |
|---|---|---|
| Average single-family value | $661,062 | |
| Average price per sq ft | $217 | |
| Median sale price | $739,780 | |
| Median sale price per sq ft | $243 | |
| Median home size | 3,046 sq ft | |
| Median new listing price | $564,177 | -22.7% |
| National size rank | 13,230 |
Sales activity
| Metric | Value | Year over year |
|---|---|---|
| Homes sold | 13 | -4.4% |
| Median days on market | 4 days | |
| Months of supply | 1.0 months | |
| New listings | 15 | -15.4% |
| Active listings | 17 | -25.1% |
| Pending sales | 13 | -30.6% |
Pricing power
| Metric | Value | Year over year |
|---|---|---|
| Average sale-to-list ratio | 99.4% | -3.7 pts |
| Share sold above list | 53.9% | -10.4 pts |
Bedroom value anchors
Average values by bedroom count. Value anchors for orientation, not appraisals.
3-bedroom
$577,616
4-bedroom
$719,023
5-bedroom
$807,901
These figures describe the single-family market for Glen Arm, Maryland ZIP 21057. They are market context, not a substitute for sold comps or a formal appraisal.