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.

Click here to email the Assessor staff.

Address:
8575 Haven Avenue, Suite 210
Rancho Cucamonga, CA 91730
Phone:
909-948-5088
Fax:
909-948-5045

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