Riverside County Board of Supervisors Meeting twolfe June 4, 2026 The Board of Supervisors meets in the County Administrative Center Board Chambers located at 4080 Lemon Street, 1st Floor, Riverside 92501. The Board meetings are open to the public, offering Spanish translation in person and online by visiting rivcocob.org. Add to Calendar Google Yahoo! Outlook.com Office.com iCal / MS Outlook Registration is closed. Please contact [email protected] to be on the waitlist.