Texas State Highway 321

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State Highway 321
SH 321, highlighted in red
Route information
Maintained by TxDOT
Length	20.29 mi[1] (32.65 km)
Existed	1939–present
Major junctions
South end	US 90 / SH 146 at Dayton
Major intersections	SH 105 at Cleveland
North end	Loop 573 at Cleveland
Location
Country	United States
State	Texas
Highway system
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec
← SH 320 → SH 322

State Highway 321 (SH 321) is a north–south highway in southeastern Texas, starting at US 90 in Dayton and ending at Loop 573 in Cleveland. The route was designated on October 30, 1939.

In Cleveland, SH 321 is also known as Houston Street, providing the main street for downtown Cleveland. It is a two lane urban highway with a left turn lane as it travels throughout Cleveland, until roughly 3/4 of a mile northeast of the city limit. From Loop 573, on southward until junction with SH 105, SH 321 is also known as SH 105. In the city of Dayton, it is referred to as North Cleveland Street, passing through residential Dayton as a 4-lane urban highway, before narrowing back down to a 2-lane rural State Highway.

SH 321 is part of the eastern Greater Houston area evacuation route, providing a corridor for communities such as Baytown, Kemah, and Pasadena.