U.S. Route 66 | U.S. Route 1 | U.S. Route 6 | U.S. Route 101 | Route 66 | U.S. Route 30 | New Jersey Route 4 | European route E65 | U.S. Route 40 | California State Route 1 | U.S. Route 1 in Maine | Pennsylvania Route 309 | European route E18 | U.S. Route 23 | European route E4 | U.S. Route 9 in New York | U.S. Route 11 | Pennsylvania Route 82 | European route E70 | U.S. Route 90 | U.S. Route 75 | U.S. Route 61 | U.S. Route 60 | Pennsylvania Route 73 | New York State Route 32 | European route E55 | U.S. Route 80 | U.S. Route 71 | U.S. Route 51 | U.S. Route 22 |
Near Union, KY 536 intersects with Old Union Road, the former routing of U.S. Route 42 before US 42 was realigned from the Union city line to just south of Ryle High School.
The western terminus of this state highway is at a signalized intersection that marks the confluence of U.S. Route 42, State Route 38, State Route 56 and State Route 142 in downtown London.
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When it was first designated in 1937, State Route 665 was routed along its present alignment between the junction of U.S. Route 42, State Route 38, State Route 56 and State Route 142 in London and U.S. Route 23 near Lockbourne.