Length: 427.138 miles
Counties Passed through: Wallace, Logan, Gove, Trego, Ellis, Russell, Lincoln, Ellsworth, Saline, Dickinson, Geary, Riley, Pottawatomie, Wabaunsee, Shawnee, Douglas, Leavenworth, Wyandotte
Highway 40 begins at the Colorado border near the town of Weskan, and followed the old Kansas Pacific Mainline, meeting K-27 at Sharon Springs and coinciding with K-25 for 7 miles in Logan County to I-70 and US 83 at Oakley. From Oakley, 40 joins I-70 across Kansas, meeting US 283 at WaKeeney, US 183 at Hays, US 281 at Russell, I-135/US 81 at Salina, US 77 at Junction City, and US 75 at Topeka before turning north off of I-70 when I-70 joins the Kansas Turnpike and turning on to a two lane route parallel to the Turnpike.
On the west end of Lawrence, 40 follows K-10 on the South Lawrence Trafficway around the west side of town before meeting US 59 on the south end Lawrence. 40 follows 59 on Iowa Street north from the Trafficway to 6th Street before turning east on 6th Street toward downtown, then turns north across the Kansas River onto North 2nd Street, crossing I-70 once again. After intersecting with I-70, 40 and 59 journey north a half mile before meeting with US 24 at Teepee Junction. 40 leaves 59 and joins 24 east to K-32 near the Douglas/Leavenworth county line before venturing northeast to Tonganoxie, where 24-40 meets K-16, then turns east toward Kansas City. At the junction with US 73 and K-7 near Bonner Springs, 24-40 follows K-7 south to the junction with I-70, where US 24 and US 40 rejoin I-70 all the way to the Missouri.History
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