Longmont Baseball League Share: RecreationNonprofitNonprofit Longmont Baseball League Visit Website Request Info 100 10th Ave. Longmont, CO 80501 720-684-6286 www.longmontbaseball.org About Map About Nonprofit baseball league for St. Vrain School District Youth. What's Nearby? Distance: 5 10 15 20 25 50 mi.