U.S. Highway 34 Business serves Estes Park, Colorado. Both of its termini are at US 34. The business route splits from the main route east of the Rocky Mountain National Park Fall River Entrance Station,[3] in the western city limits of Estes Park and enters town on West Elkhorn Avenue. The main route continues around the northern edge of Estes Park on Wonderview Avenue, passing a large number of motels. At Moraine Avenue, It joins US 36 in downtown Estes Park. It returns to US 34 after about 1.7 miles (2.7 km) at an intersection with Wonderview Avenue, Big Thompson Avenue, and North St. Vrain Avenue. The business route was established in 1964.[2]
U.S. Highway 34 Business serves Greeley, Colorado. Both termini are at US 34. It leaves US 34 and becomes 10th Street as it enters Greeley. At 23rd Avenue, it splits off into two parallel one-way streets until it intersects 10th Avenue. The highway immediately intersects US 85 Business (8th Avenue). US 34 Business then enters a concurrency with US 85 Business, heading south for eight city blocks before turning east onto 18th Street at the northeastern edge of the University of Northern Colorado. It continues east out of Greeley before crossing the South Platte River and terminating at US 34.