Interstate 55

Interstate 55
I-55 highlighted in red
Route information
Length	964.25 mi[1] (1,551.81 km)
Existed	1957–present
NHS	Entire route
Major junctions
South end	I-10 in LaPlace, LA
Major intersections	I-12 in Hammond, LA I-20 / US 49 in Jackson, MS I-69 in Hernando, MS I-40 / US 61 / US 64 / US 70 / US 78 / US 79 in West Memphis, AR I-57 / US 60 in Sikeston, MO I-44 / I-64 / US 40 in St. Louis, MO I-70 / US 40 from East St. Louis to Troy, IL I-72 / US 36 in Springfield, IL I-74 in Bloomington, IL I-39 / US 51 in Normal, IL I-80 in Channahon, IL I-90 / I-94 in Chicago, IL
North end	US 41 in Chicago, IL
Location
Country	United States
States	Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future

Interstate 55 (I-55) is a major Interstate Highway in the central United States. As with most primary Interstates that end in a five, it is a major cross-country, north–south route, connecting the Gulf of Mexico to the Great Lakes. The highway travels from LaPlace, Louisiana, at I-10 to Chicago, Illinois, at U.S. Route 41 (US 41, Lake Shore Drive), at McCormick Place. The major cities that I-55 connects to are (from south to north) New Orleans, Louisiana; Jackson, Mississippi; Memphis, Tennessee; St. Louis, Missouri; and Chicago, Illinois.

The section of I-55 between Chicago and St. Louis was built as an alternate route for U.S. Route 66 (US 66). The Interstate crosses the Mississippi River twice: once at Memphis and again at St. Louis.