MedExpress Urgent Care Share: Health Care Services MedExpress Urgent Care Visit Website Request Info 601 S. Main St. Longmont, CO 80501-6427 717-617-9109 About Map About Coming soon to Longmont! MedExpress Urgent Care treats illnesses and injuries for all ages every day from 8 a.m. to 8 p.m., no appointments necessary. All major insurances accepted. What's Nearby? Distance: 5 10 15 20 25 50 mi.