U.S. Route 166

U.S. Route 166 (US 166) is a west–east United States highway. This route and US-266 are the only two remaining parts of historic U.S. Route 66 (which was decommissioned in 1985), since US-666 was renumbered to US-491 in 2003.
US-166 meets the old route of US-66, now designated US-69 Alternate, in Baxter Springs in the southeast corner of Kansas.