California Regional Center Phone Numbers & Addresses Alta California Regional Center Areas: Alpine, Colusa, El Dorado, Nevada, Placer, Sacramento, Sierra, Sutter, Yolo, and Yuba counties Address: 2241 Harvard Street, Suite 100 Sacramento, CA 95815Phone: (916) 978-6400TDD: (916) 489-4241Fax: (916) 489-1033Website: http://www.altaregional.orgExecutive Director: Phil Bonnet Field Offices Grass Valley333 Crown Point Circle, Suite 200Grass Valley, CA 95945Telephone: (530) 272-4231Fax: (530) 272-4637Roseville516 Gibson Drive, Suite 150Roseville, CA 95678Telephone: (916) 437-6900Fax: (916) 978-6583Woodland283 W….