H.G. Osborne Building
300 North Flower Street
Santa Ana, CA 92703-5000
(714) 834-2300
Building Hours
8:00am to 5:00pm, Monday - Friday
Headquarters is home to the following departments:
DPC
7:30 am to 4:00 pm,
Monday – Thursday
Friday by Appointment Only
First Floor
Central Files and
Geomatics Public Counter
7:30 am to 4:00 pm, Monday – Friday
Second Floor, Room 252
Planning and Development Services
3rd Floor
Orange County Parks
4th Floor
Building Services,
Human Resources, and
Road Division
5th Floor
Information and
Technology Services,
Project Management Division and
Right-of-way Engineering
6th Floor
Right-of-way Engineering
Public Counter
7:30 am to 4:00 pm, Monday – Friday
Room 632
Flood Division,
Watershed and
Coastal Resources
7th Floor
Director, Administration and
Internal Services
8th Floor
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