State Route 139 was originally established in 1933 as the road from former Route 8west to Consumers, a distance of about. In 1969, SR-139 was extended east past US-6 and north through Spring Glen to meetState Route 157, eight years after SR-157 had been extended north from Spring Glen to Helper. The route was significantly shortened in 1975, with the west of US-6 being deleted from the state highway system, leaving SR-139 as a short connector between US-6 and SR-157. In 1978, SR-139 was lengthened by when reconstruction of US-6 in the area necessitated moving its intersection with SR-139 southward, resulting in the current alignment.