sunnyvale ca what county
Sunnyvale Sunnyvale is at the heart of Silicon Valley and borders the cities of San Jose, Mountain View, and Santa Clara. Located within Santa Clara County, this city is one of the few in the nation to have a Department of Public Safety which combines both fire and police agencies under a common service center. All personnel of this organization are trained as firefighters, police officers, and EMTs so all employees of the department can respond to any emergency.