Global HQ : 475 Brannan St., Suite 430, San Francisco, CA 94107 Phone: (650) 316-7500 Website : www.upwork.com Chicago Office : 525 W. Van Buren, Suite 1100, Chicago, IL 60607 Mailing Address : 655 Montgomery St., Suite 490, Dept. 17022, San Francisco, CA 94111-2676 Upwork Global Inc., formerly Elance-oDesk, is an American freelancing platform headquartered in Santa Clara and San Francisco, California. The company was formed in 2013 as Elance-oDesk, after the merger of Elance Inc. and oDesk Corp.