Rainbow Boulevard is a main roadway located in southeastern Wyandotte County and northeastern Johnson County, Kansas.
It is an undivided four-lane roadway with a posted speed limit of 35 mph that runs north–south through the Kansas City metropolitan area.
Rainbow Boulevard was named to commemorate the World War I veterans of Rosedale, Kansas, and of the Kansas City metropolitan area.
Upon America entering the war, it was decided that the first division of National Guard troops to be called up should be drawn from as many states as possible.
This mixture prompted Secretary of War Baker to nickname the 42nd the Rainbow Division.