Oklahoma State Highway 66 Oklahoma State Highway 66 State Highway 66 (abbreviated SH-66) is a state highway in the U.S. state of Oklahoma, beginning at U.S. Highway 81 in El Reno and ending at U.S. Highway 60 near White Oak. The highway was designated in 1985 as a replacement for the decommissioned US-66. Although most of the highway follows Historic Route 66, the highway follows US-66's final alignment, joining Interstate 44 through Tulsa and Oklahoma City, while older versions of the route follow various city streets through both cities. The highway has retained its importance for most of its length due to its paralleling
Oklahoma State Highway 156 along the highway. The entirety of SH-156 was once part of US-77. US-77 was realigned and SH-156 was assigned to the old alignment on March 1, 1965. On July 14, 1969, US-60/US-77/US-177 was realigned at SH-156's north end, necessitating a slight extension northward. No further changes have taken place since 1969. Oklahoma State Highway 156 State Highway 156, abbreviated SH-156, is a highway maintained by the U.S. state of Oklahoma. Spanning through the north-central part of the state, it connects the town of Marland, Oklahoma to US-60/US-77/US-177 in the north to US-77 in the west. It is the former alignment