San Mateo County, CA Housing Market Brief
county · CA · score computed October 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.
Population band 5 of 5 (population 103,008–9,808,667) · comparable within its band
Where is San Mateo County, CA in its market cycle?
San Mateo County, CA is classified as Recovering — turning back up after a downturn. This is a classification of recent (1–12 month) momentum, not a price forecast.
What’s the forecast for San Mateo County, CA?
County-level forecasts are paused (since Oct 18, 2026). The new public-data model we built to replace them didn't pass our accuracy test, and we won't publish forecasts again until a model does.
San Mateo County, CA housing market data
| Metric | Value | YoY | Source |
|---|---|---|---|
| Median Sale Price | $1.7M | ▲ +5.3% | Redfin |
| Median Days on Market | 14 days | ▼ -26.3% | Redfin |
| Months of Supply | 1.8 | 0% | Redfin |
| Homes for Sale | 779 | ▼ -7.3% | Redfin |
| Homes Sold | 434 | ▼ -8% | Redfin |
| Median Price / Sq Ft | $1K | ▲ +1.8% | Redfin |
How has San Mateo County, CA’s Alpha Score moved?
Markets like San Mateo County, CA
- Kauai County, HI, HIcounty26
- San Francisco County, CA, CAcounty22
- Alameda County, CA, CAcounty21
- Napa County, CA, CAcounty28
- Jefferson County, CO, COcounty23
- Contra Costa County, CA, CAcounty21
- Honolulu County, HI, HIcounty27
- New York County, NY, NYcounty17
- Santa Clara County, CA, CAcounty29
- Charlottesville, VA, VAcounty32
Frequently asked questions
Is San Mateo County, CA a buyer's or seller's market?
In the scores computed October 2026, San Mateo County, CA is classified as a Deep Buyer's Market, based on its Alpha Score of 24 out of 100. The classification reflects current price, building, 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 $1.7M, having risen 5.3% over the past year, according to Redfin.
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 (71/100) 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.