Pinnacol Assurance Share: Insurance Visit Website Request Info 7501 E. Lowry Blvd. Denver, CO 80230 303-361-4000 303-361-5785 (fax) www.pinnacol.com About Map About Worker's Comp Insurance provider.For information on the Longmont Area Chamber of Commerce safety group through Pinnacol Assurance, contact Kathy Stevens at 720-864-2871. What's Nearby? Distance: 5 10 15 20 25 50 mi.