Ontario Building Department
CLOSED NOW
Today: 7:30 am - 5:30 pm
Tomorrow: 7:30 am - 5:30 pm
Fax: (909) 395-2121
Fax: (909) 395-2180
TollFree: (800) 451-5627
Phone: (909) 395-2025
Ontario Engineering Department
Phone: (909) 395-2023
Address: 303 E B St, Ontario, CA 91764
Website: https://www.ontarioca.gov/contact-us
211 W 5th St, Ontario, CA 91762
1333 S Bon View Ave, Ontario, CA 91761
215 E C St, Ontario, CA 91764
9955 Fremont Ave, Montclair, CA 91763
10575 Central Ave, Montclair, CA 91763
1650 W Orange Grove Ave, Pomona, CA 91768
2450 E Philadelphia St, Ontario, CA 91761
13180 Central Ave, Chino, CA 91710
9657 Arrow Rte, Rancho Cucamonga, CA 91730
10440 Ashford St, Rancho Cucamonga, CA 91730