The original southern terminus was at
Atoka, Oklahoma at an intersection with
U.S. Highway 75. From the creation of the highway in 1926 until April 11, 1935, US 73 was split between
Oswego, Kansas and
Horton, Kansas. US 73E followed modern
US 160 from Oswego to
Columbus, then modern
US 69 to Kansas City, where it then latched onto what is now US 73. The US 73E designated then went from Kansas City to Horton. US 73W followed the route of modern
U.S. Route 59 from Oswego to
K-39, K-39 west to
Chanute, modern
U.S. Route 169 from Chanute to
Garnett, modern US 59 again from Garnett to
Nortonville, and then modern
U.S. Route 159 from Nortonville to
Horton. On April 10, 1935, US 73 was truncated at
Kansas City with the modern designations taking over the old routes and US 69 taking over the Atoka-Oswego segment. In Kansas City, US 73 previously followed
U.S. Route 24 into downtown
Kansas City, Kansas, terminating at the
Intercity Viaduct (Lewis and Clark Viaduct), before
Interstate 435 was completed. After I-435 was completed, US 73 ended at its intersection with I-435. On December 1, 2008, the southern terminus was rerouted, along with US 24 and US 40, southward along K-7 to its new terminus at I-70. Nebraska also had a split highway, with the split between
Tekamah and
Winnebago between 1935 and 1957. US 73E went north through
Decatur along the current route of
U.S. Route 75, while US 73W went west from Tekamah along current
Nebraska Highway 32 to
Oakland, then north from Oakland in a concurrency with
U.S. Route 77. The original northern terminus was south of
Auburn, Nebraska, near
Howe, Nebraska. US 73 went east through Howe, then south to
Stella, Nebraska, then east through
Shubert, Nebraska, then south to the current highway. In 1932, the highway was extended to
South Sioux City, Nebraska. In 1965, the route was shortened to
Winnebago, Nebraska. In 1984, U.S. 75 was removed from western Iowa along
Interstate 29 and placed on U.S. 73's route, superseding it through
Omaha, Nebraska and truncating the highway to its present northern terminus near
Dawson, Nebraska.
K-227 was a highway in Kansas that was designated on September 9, 1968. K-227's southern terminus was at
K-4 and
U.S. Route 59 (US-59) in the city of
Atchison and the northern terminus was at
K-9 and
US-73 in Atchison. In 1980, US-73 was realigned along K-227 and at that time K-227 was decommissioned. ==Major intersections==