United States California Castro Valley
California · Castro Valley · 2026
Top real estate brokerages in Castro Valley, CA
Count taken September 5, 2026Page built September 5, 2026
160 real estate agents in Castro Valley, California had a published brokerage profile on September 5, 2026. CENTURY 21 Masters is the largest real estate brokerage in Castro Valley with 63 agents, 39.4% of the 160 whose profile names a brokerage; the three largest together hold 80%.
Real estate brokerages in Castro Valley, ranked by agents
Every brokerage with 3 or more agents in Castro Valley. A company that publishes no office names appears as one row covering all its offices in the city.
| Brokerage | Agents | Share of attributed agents | Brand | |
|---|---|---|---|---|
| 1 | CENTURY 21 Masters | 63 | 39.4% | Century 21 |
| 2 | Berkshire Hathaway HomeServices | 37 | 23.1% | |
| 3 | Coldwell Banker Realty | 28 | 17.5% | Coldwell Banker |
| 4 | RE/MAX | 23 | 14.4% | |
| 5 | LPT Realty | 6 | 3.8% |
Plus 3 more brokerages with one agent each.
How Castro Valley compares with California
Castro Valley holds 0.3% of the agents counted in California and ranks 96th of the 895 California cities with at least one agent. The largest brokerage's share is 39.4% here against 14.1% for Keller Williams across California as a whole, so the Castro Valley market is more concentrated than the state. 9.7% of the 154 checked agents in Castro Valley have a website of their own, against 10.5% statewide. 96.3% publish a direct phone number (statewide 90.9%).
How many real estate agents are in California?
Other California cities
- San Diego 2,517
- Los Angeles 1,393
- Beverly Hills 1,258
- San Francisco 1,148
- Newport Beach 912
- Pasadena 895
- Sacramento 879
- Irvine 849
- San Jose 762
- Long Beach 705
- Torrance 660
- Los Gatos 657
- Santa Monica 657
- Danville 640
- Roseville 622
Where the data comes from
Counted from the public agent directories of 8 brokerage brands with agents in Castro Valley. Independent brokerages outside those networks are not counted, so this is a ranking among the networks we can see, not a census of every licensee in the city. Full method on the national page.
Every agent in this count has a published email address on file; the Castro Valley rows are part of the California realtor email list sold at usrealtorlist.com, and this page publishes only the totals.
Questions this page answers
- What is the largest real estate brokerage in Castro Valley, CA?
- CENTURY 21 Masters with 63 agents, 39.4% of Castro Valley agents whose profile names a brokerage, ahead of Berkshire Hathaway HomeServices (37).
- How many real estate agents are in Castro Valley, CA?
- 160 as of September 5, 2026, counting agents with a published brokerage profile. That is 0.3% of the 58,902 counted in California.
Cite this page
Realty Census (2026). Top real estate brokerages in Castro Valley, CA: 160 agents. Count dated 2026-09-05. https://realtycensus.com/california/castro-valley/