San Mateo County, CA Housing Market Brief
county · CA · as of August 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.
What’s the forecast for San Mateo County, CA?
Our model forecasts San Mateo County, CA’s home prices to hold flat over the next 12 months (high confidence).
This is a separate, forward-looking view — not the cycle classification above. See how past forecasts performed on the track record, or the full local forecast with its confidence range on the market page.
San Mateo County, CA housing market data
| Metric | Value | YoY |
|---|---|---|
| Median Sale Price | $1.7M | ▼ -1.1% |
| Median Days on Market | 19 days | 0% |
| Months of Supply | 1.5 | ▼ -16.7% |
| Homes for Sale | 716 | ▼ -11.5% |
| Homes Sold | 500 | ▲ +9.2% |
| Median Price / Sq Ft | $1K | ▲ +2% |
How has San Mateo County, CA’s Alpha Score moved?
Markets like San Mateo County, CA
- Douglas County, NV, NVcounty45
- Washoe County, NV, NVcounty50
- Santa Clara County, CA, CAcounty44
- San Francisco County, CA, CAcounty50
- Alameda County, CA, CAcounty45
- Ada County, ID, IDcounty50
- New York County, NY, NYcounty41
- Carson City, NV, NVcounty43
- Marin County, CA, CAcounty45
- Lafayette County, MS, MScounty45
Frequently asked questions
Is San Mateo County, CA a buyer's or seller's market?
As of August 2026, San Mateo County, CA is classified as a Balanced Market, based on its Alpha Score of 47 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 $1.7M, having fallen 1.1% over the past year.
How affordable is San Mateo County, CA?
San Mateo County, CA scores 1 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 (1/100). 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.