If you look at a large city, San Jose, there are over 2500 offices reported. The records show 4451 agents having sold at least one home.
Mlslistings.com records shows 8688 agents having sold at least one home in 2012 (primarily Santa Clara County & San Mateo County) . There are surely more licensed agents. 122 of these agents sold at least 25 homes. There are many licensed agents who did not sell anything in 2012.
Although different offices may have the same company name such as Keller Williams, the offices may be independently owned and operated.
Santa Clara real estate statistics at
Top 2 agent nationwide at Keller Williams Realty
Over 30 years experience
Over 1,000 homes sold in Santa Clara and San Mateo Counties
board members. The number of brokerages would be around 2,000 both large and small brokerages.
Richard Matusich Realtor DRE#00358728