MD 20F was an unnamed 0.52 miles connector from southbound MD 151 to MD 20D. The highway began as a loop ramp from southbound MD 151, crossed east over both directions of MD 151, and ended at MD 20D. What became MD 20F was constructed as one of several ramps built to connect MD 151 and MD 20 with the new Bethlehem Boulevard in 1957 and 1958.