City comparison
Castro Valley, CA is about 50 miles (90 km) from San Francisco, CA in a straight line. By road, the drive is roughly 70 miles, or about 1 h behind the wheel at highway speeds.
Driving distance is a rough estimate (great-circle × 1.25); driving time assumes a 60 mph blended average. Real trips run 10–20% longer with stops.
A direct flight from Castro Valley, CA to San Francisco, CA takes about 6 min, covering roughly 50 miles in a straight line. Connecting itineraries with a layover typically add 1–3 hours.
Block-to-block estimate at ~500 mph cruise, including taxi, climb, and descent — what an airline would publish, not pure airborne time.
San Francisco has a population of 851,036, vs 65,444 in Castro Valley — about 13.0× larger by population. By land area, San Francisco covers about 47 sq mi vs 17 sq mi for Castro Valley.
Population from US Census ACS. Land area from the Census Gazetteer (city proper, excluding inland water).
Cost indices by category, with the US city average (100) marked.
Index: 100 = US city average. Lower is more affordable.
Side-by-side costs, salaries, and sub-category indices.
| Metric | Castro Valley | San Francisco | Difference |
|---|---|---|---|
| Median rent | $2,383/mo | $2,316/mo | 2.9% higher in Castro Valley |
| Median home value | $1,013,900 | $1,348,700 | 33.0% higher in San Francisco |
| Median household income | $132,174 | $136,689 | 3.4% higher in San Francisco |
| Groceries index | 108.1 | 103.9 | 4.0% higher in Castro Valley |
| Utilities index | 168.3 | 162.7 | 3.5% higher in Castro Valley |
| Transportation index | 106.1 | 102.0 | 3.9% higher in Castro Valley |
| Healthcare index | 106.0 | 100.2 | 5.9% higher in Castro Valley |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Castro Valley, you'd need $98,070 in San Francisco to maintain your standard of living.
Climate, safety, and demographics side by side.
San Francisco, CA is about 1.9% cheaper overall than Castro Valley, CA, based on our cost-of-living index. If you earn $80,000 in Castro Valley, you'd need about $78,456 in San Francisco to keep the same standard of living.