Ontario Assessor District Office
Hours: 8:00 am – 5:00 pm
Services: Assessment Services for properties in Chino, Chino Hills, Montclair, Ontario, Rancho Cucamonga and Upland.
Email the Assessor staff
Address:
8575 Haven Avenue, Suite 210
Rancho Cucamonga, CA 91730
Rancho Cucamonga, CA 91730
Phone:
909.948.5088
Fax:
909.948.5045
