San Mateo County, CA Housing Market Brief
county · CA · as of May 2026
What is San Mateo County, CA’s Alpha Score?
The Alpha Score is a composite 0–100 index of market strength, a weighted blend of five dimensions. See the methodology.
Where is San Mateo County, CA in its market cycle?
San Mateo County, CA is classified as Mature — holding near a healthy peak. This is a classification of recent (1–12 month) momentum, not a price forecast.
San Mateo County, CA housing market data
| Metric | Value | YoY |
|---|---|---|
| Median Sale Price | $1.8M | ▲ +4.1% |
| Median Days on Market | 14 days | 0% |
| Months of Supply | 1.6 | ▼ -11.1% |
| Homes for Sale | 782 | ▼ -14.8% |
| Homes Sold | 483 | ▼ -3% |
| Median Price / Sq Ft | $1K | ▲ +5.1% |
| Sale-to-List Ratio | 105.6% | ▲ +1.5% |
How has San Mateo County, CA’s Alpha Score moved?
Markets like San Mateo County, CA
- Alameda County, CA, CAcounty42
- Sonoma County, CA, CAcounty39
- Arlington County, VA, VAcounty40
- Contra Costa County, CA, CAcounty40
- Santa Barbara County, CA, CAcounty40
- Benton County, OR, ORcounty38
- Albany County, WY, WYcounty39
- Los Angeles County, CA, CAcounty42
- Orange County, CA, CAcounty42
- Marin County, CA, CAcounty38
Frequently asked questions
Is San Mateo County, CA a buyer's or seller's market?
As of May 2026, San Mateo County, CA is classified as a Balanced Market, based on its Alpha Score of 41 out of 100. The classification reflects current price, inventory, affordability, economic, and rental-yield conditions.
Are home prices rising or falling in San Mateo County, CA?
The median sale price in San Mateo County, CA is $1.8M, having risen 4.1% over the past year.
How affordable is San Mateo County, CA?
San Mateo County, CA scores 0 out of 100 on affordability — relatively unaffordable relative to local incomes and prevailing mortgage rates compared with other counties.
What's driving San Mateo County, CA's Alpha Score?
San Mateo County, CA's strongest dimension is Economic Strength (68/100) and its weakest is Affordability (0/100). The Alpha Score is a weighted blend of all five dimensions.
Want the live, interactive view of San Mateo County, CA? Open the full market dashboard — charts, ZIP-level drill-down, and watchlist tracking. Explore the map or read the methodology.