I-45
I-45 highlighted in red
Route information
Length	284.913 mi[1] (458.523 km)
Existed	1971–present
NHS	Entire route
Major junctions
South end	SH 87 in Galveston
Major intersections	Sam Houston Tollway / Beltway 8 in Houston I-610 (South Loop) / SH 35 / SH 225 in Houston I-69 / US 59 / SH 288 in Houston I-10 / US 90 in Houston I-610 (North Loop) in Houston SH 99 Toll in Houston, TX Hardy Toll Road in Spring US 190 in Huntsville I-20 in Dallas US 175 in Dallas
North end	I-30 / I-345 / US 75 in Dallas
Location
Country	United States
State	Texas
Counties	Galveston, Harris, Montgomery, Walker, Madison, Leon, Freestone, Navarro, Ellis, Dallas
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec
← SH 44 SH 45 →

Interstate 45 is an Interstate Highway in the state of Texas in the United States. It goes from Galveston north to Dallas. The route is 284.913 miles (458.523 km) long.^[1]

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