Unshakable ZIP Data 98188 | Seatac, WA Housing Market
Seatac · King County · Seattle-Tacoma-Bellevue, WA metro · Washington · Data updated June 19, 2026
The median sale price in ZIP 98188, Seatac, Washington is $608,819 at $324 per square foot. 30 single-family homes sold in the latest period, down 25.4 percent from a year earlier. Homes sit a median of 6 days on market with 4.1 months of supply. Sellers are getting 99.7 percent of list price and 24.1 percent of homes sold above asking.
Balanced market.
Value anchors
| Metric | Value | Year over year |
|---|---|---|
| Average single-family value | $636,310 | |
| Average price per sq ft | $339 | |
| Median sale price | $608,819 | |
| Median sale price per sq ft | $324 | |
| Median home size | 1,877 sq ft | |
| Median new listing price | $594,915 | +25.3% |
| National size rank | 4,326 |
Sales activity
| Metric | Value | Year over year |
|---|---|---|
| Homes sold | 30 | -25.4% |
| Median days on market | 6 days | |
| Months of supply | 4.1 months | |
| New listings | 56 | -16.7% |
| Active listings | 78 | -9.3% |
| Pending sales | 39 | -23.0% |
Pricing power
| Metric | Value | Year over year |
|---|---|---|
| Average sale-to-list ratio | 99.7% | -0.2 pts |
| Share sold above list | 24.1% | -0.9 pts |
Bedroom value anchors
Average values by bedroom count. Value anchors for orientation, not appraisals.
1-bedroom
$209,063
2-bedroom
$338,462
3-bedroom
$599,030
4-bedroom
$703,910
5-bedroom
$795,548
These figures describe the single-family market for Seatac, Washington ZIP 98188. They are market context, not a substitute for sold comps or a formal appraisal.