TinkerMill Share: NonprofitNonprofit Visit Website Request Info 1840 Delaware Pl., Unit A Longmont, CO 80501 720-204-3090 www.Tinkermill.org Hours: 24x7 member access, open to the public when a member is present About Us Nonprofit STEM education and economic development group. About Media Map About Nonprofit STEM education and economic development group. Media Directions 1840 Delaware Place between Boston and Sunset. Directly adjoining the east boundary of the Boulder County Fairgrounds. What's Nearby? Distance: 5 10 15 20 25 50 mi.