|Auxiliary route of US 36|
|Length||804 mi[ citation needed] (1,294 km)|
|Existed||1951[ citation needed]–present|
|West end||US 6 / US 34 in Edison, NE|
|East end||I-74 / I-465 in Speedway, IN|
U.S. Highway 136 is a spur of U.S. Highway 36. It runs from Edison, Nebraska, at U.S. Highway 6 and U.S. Highway 34 to the Interstate 74/ Interstate 465 interchange in Speedway, Indiana. This is a distance of 804 miles (1,294 km). US 136 never meets its parent, US 36. However, it does come within 2 miles of it at its interchange with I-465/I-74 at its eastern terminus.
U.S. 136 passes through the following states:
U.S. 136 closely parallels Nebraska's southern border from its western terminus near Edison to the Missouri River. It passes through Beatrice and exits the state at Brownville via the Brownville Bridge. It is designated the Heritage Highway throughout Nebraska.
US 136 enters Missouri on the west just east of Brownville, Nebraska, over the Missouri River. It leaves the state at Alexandria, Missouri, on the east concurrent with US 61. During its journey, it enters every county seat in the nine counties it traverses. The distance across Missouri is about 240 miles (390 km). US 136 is two lanes for the full distance.
US 136 in Iowa consists of a 3.6-mile-long (5.8 km) route which travels across the south-easternmost tip of Lee County. It crosses the Des Moines River from Missouri with US 61, overlapping for just over 1 mile (1.6 km). East of the US 61 split, US 136 is overlapped by US 61 Bus. through Keokuk. US 136 enters Keokuk along 7th Street, which takes a turn to the northeast towards downtown. At the intersection with Main Street, which is the southern end of US 218, it turns to the southeast towards the Mississippi River. US 136 travels another 2⁄3 mile (1.1 km) before crossing the Mississippi into Hamilton, Illinois via the Keokuk–Hamilton Bridge. 
US 136 spends 225.95 miles (363.63 km) within the state of Illinois.  It crosses the Mississippi River into Illinois from Iowa just past Keokuk. It travels through historic Carthage, Illinois; site of the martyrdom of Joseph Smith, founder of the Mormon religion and home of the Kibbe biological museum, then Macomb, Illinois, where Western Illinois University is located. It continues as an east–west route intersecting with I-155 and I-55 south of Bloomington-Normal and north of Lincoln in Central Illinois. It later intersects with I-74, and then I-57 just outside Rantoul about 15 miles (24 km) north of Champaign-Urbana. US 136 then travels concurrent with Illinois Route 1 in far east central Illinois before entering Danville, Illinois. At Danville, it turns east to go into Indiana.
Through most of its duration in Indiana, US 136 parallels I-74. Within Indianapolis, the highway is also called Crawfordsville Road, and US 136 ends in the town of Speedway, Indiana, at the I-74/ I-465 interchange where Crawfordsville Road continues without numbered designation. As part of Indiana's Accelerate 465 project, the I-74/I-465 interchange was being reworked to eliminate tight spiral ramps and to add a full interchange for US 136 with I-465.  It was completed in 2014. The entire portion of US 136 in Indiana is part of the Dixie Highway.
In Illinois, the designation of US 136 in 1951 replaced IL 10 from the Iowa state line in Keokuk to IL 119 in Havana, The route then followed IL 119 to an intersection with IL 1, where it traveled south to IL 10, heading east to Danville and the Indiana state line. 
In Missouri, most of US 136 was designated as Route 4 in 1922. This highway began at St. Joseph and followed present US 169 to Stanberry, turning east there to the Iowa state line along US 136. The rest of US 136 was initially Route 1A ( Nebraska to Rock Port), part of Route 1, and Route 18 ( Tarkio to Stanberry). The east end was truncated to Wayland in 1926, when US 61 was designated over the part east to Iowa, and later that decade Route 4 absorbed the former Route 52 from St. Joseph southwest to Atchison, Kansas. When this extension became part of US 59 in the early 1930s, the portion west of Stanberry was deleted in favor of US 59 and US 169; Route 4 was instead extended west, absorbing Route 18 and Route 102 (the latter a ca. 1930 renumbering of Route 1A). US 136 replaced Route 4 east of Stanberry in 1951 and the rest in 1960.
In Nebraska, US 136 was previously "Route 3." US 136 replaced Route 3 in 1960.
US 136 was originally proposed to use I-465 in Indiana to the US 36 interchange so US 136 could meet its parent, US 36.
- US 6 / US 34 north-northwest of Edison
- US 183 north-northwest of Alma. The highways travel concurrently to Alma.
- US 281 in Red Cloud
- US 81 south-southeast of Hebron
- US 77 in Beatrice
- US 75 in Auburn
- I‑29 in Rock Port
- US 275 northwest of Rock Port
- US 59 south-southwest of Tarkio. The highways travel concurrently to Tarkio.
- US 71 east-southeast of Burlington Junction. The highways travel concurrently to Maryville.
- US 169 in Stanberry. The highways travel concurrently to north-northwest of Darlington.
- US 69 southwest of Bethany. The highways travel concurrently to Bethany.
- I‑35 in Bethany
- US 65 in Princeton. The highways travel concurrently through Princeton.
- US 63 south-southeast of Glenwood. The highways travel concurrently to Lancaster.
- US 61 west-northwest of Alexandria. The highways travel concurrently to Keokuk, Iowa.
- US 218 in Keokuk
- US 67 in Macomb. The highways travel concurrently to east of Macomb.
- US 24 in Duncan Mills. The highways travel concurrently to south of Duncan Mills.
- I‑155 east-northeast of Emden
- I‑55 southeast of McLean
- US 51 in Heyworth
- I‑74 south-southeast of Le Roy
- US 150 southeast of Le Roy
- I‑57 in Rantoul
- US 45 in Rantoul
- US 150 in Danville
- US 41 in Veedersburg. The highways travel concurrently through Veedersburg.
- US 231 in Crawfordsville
- I‑74 / I‑465 on the Indianapolis– Speedway line.
- "2009 Volume of Traffic on the Primary Road System of Iowa" (PDF). Iowa Department of Transportation. January 1, 2009. Retrieved June 26, 2010.
- Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
- "Accelerate 465". Retrieved 2013-01-29.
- "New Route 136 Being Marked". Decatur Herald. February 20, 1951. p. 3. Retrieved May 11, 2016 – via Newspapers.com.
|Browse numbered routes|
|← N-133||NE||N-137 →|
|← Route 135||MO||Route 137 →|
|← Iowa 130||IA||Iowa 136 →|
|← IL 135||IL||IL 136 →|
|← SR 135||IN||SR 140 →|