About Our Company

Diamond PEO’ goal is to improve your business’ performance by providing training and staffing that sets your company up for success. We offer these services throughout the United States.

Business Solutions

Running a business is not easy. With Diamond PEO, you have all of your employee needs under control, leaving you to concentrate on your company’s common management challenges.

Our company understands the laws and issues of human resources and employee benefits. We manage the risks and put the right people in the right places. We interview, screen, and verify the personnel so that you can have complete confidence in your staff. Diamond PEO takes care of all the paperwork before, during, and after we place employees, and we do it on your site.

Diamond PEO Offices

Corporate Office
27442 Calle Arroyo
Cottage 45
San Juan Capistrano, CA 92675

Los Angeles Office
879 West 190 Street Suite 400
Gardena, CA 90248

Riverside Office
12139 Mt Vernon Ave Suite 105
Grand Terrace, CA 92313

Diamond PEO Canada Office
2416 Main Street, Suite 398
Vancouver, BC, V5T 3E2

Oregon Office
650 NE Holladay Street, Suite 1600
Portland, OR 97232

Service Area
Nationwide Services, including Hawaii & Alaska.


(714) 796-9110

Hours of Operation
Monday – Friday: 8:00 a.m. – 5:00 p.m.

Customer Contact Hours
For 24/7 After-Hours Support,
Call (949) 724-4504