Oklahoma State Highway 4

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State Highway 4
OK 4 mainline in red
Route information
Maintained by ODOT OTA
History	1941–present (western SH-4)[1] 1963–present (eastern SH-4)[2]
Section 1
Length	37.3 mi (60.0 km)
South end	US 62 / US 277 / SH-9 south of Newcastle
North end	Edmond Road / NW 178th Street in Piedmont
Section 2
Length	12.01 mi[3] (19.33 km)
West end	US 259 in Smithville
East end	AR 4 at the Arkansas state line
Location
Country	United States
State	Oklahoma
Highway system
Oklahoma State Highway System Interstate US State Turnpikes
← SH-3 → SH-5

State Highway 4, abbreviated as SH-4 or OK-4, is a designation for two distinct highways maintained by the U.S. state of Oklahoma. One of them serves as an important route through the suburbs west of Oklahoma City, while the other connects US-259 to the Arkansas state line west of Cove, Arkansas. SH-4 has no lettered spur routes.

The two SH-4s were never connected. The Central Oklahoma highway was established in 1941 and gradually extended to its present extent between then and 2003. The Eastern Oklahoma highway was originally numbered SH-21, and was renumbered to SH-4 in 1963.