Contra Costa County
Contra Costa County, California has 7 submarkets published here, with effective property tax rates of 1.07% to 1.35% of assessed value for fiscal year 2025-26. On one $1,600,000 reference loan at 20% down and 6.5% APR, monthly carrying cost runs $9,713 to $10,086, so the tax line is the only variable. The fastest published commute is 20 min door-to-door from Orinda to Oakland City Center by BART at AM peak. Every figure is an objective public metric or arithmetic on one, and names its source.
| Submarket | City | Median $/sqft (SFR) | Effective tax rate | Monthly cost, reference loan |
|---|---|---|---|---|
| Alamo | Alamo | $1,000 | 1.07% | $9,713 |
| Danville | Danville | $900 | 1.07% | $9,713 |
| Gale Ranch, San Ramon | San Ramon | $700 | 1.35% | $10,086 |
| Lafayette | Lafayette | $1,150 | 1.07% | $9,717 |
| Moraga | Moraga | $1,000 | 1.08% | $9,728 |
| Orinda | Orinda | $1,150 | 1.08% | $9,730 |
| Walnut Creek | Walnut Creek | $800 | 1.08% | $9,733 |
Monthly cost holds one reference loan constant across every submarket so the tax line is the only variable; the full assumption set is on each submarket page. Effective rates are composited from county FY 2025-26 tax rate books. Arithmetic only — not an appraisal.
Contra Costa County: questions and answers
- What are effective property tax rates in Contra Costa County?
- Across the 7 Contra Costa County submarkets published here, effective rates run 1.07% to 1.35% of assessed value for fiscal year 2025-26, composited from county tax rate books. Each submarket page shows the levy, bond, measure, and Mello-Roos components with its source.
- What does the reference loan cost per month in Contra Costa County?
- $9,713 to $10,086 per month on the same $1,600,000 reference loan at 20% down, 6.5% APR, 30-year fixed. Lowest published total is Alamo at $9,713. The tax line is the only variable. Arithmetic only.
- What is the fastest published commute from Contra Costa County?
- 20 min door-to-door at AM peak, from Orinda to Oakland City Center by BART. Door-to-door AM-peak estimates for all 7 published Contra Costa County submarkets are on their individual pages. Source: data/commute/static.csv.