The section from I-80 in Omaha to I-29 in Crescent, Iowa, was originally designated as I-280, but, because it extended into Iowa and because it conflicted with I-280 in the Quad Cities area of Iowa, the route was renumbered I-680.
From Omaha along I-80 to Crescent on I-29, this section was originally known as I-280; however, because it extended into Iowa and overlapped with another I-280 route in the Quad Cities area, the road was renumbered as I-680.