List of Interstate Highways in South Carolina

Interstate Highways of South Carolina
Interstate Highways of South Carolina
	Highway shields for I-26, I-385, and I-20 Bus. Loop
	Interstate Highways highlighted in red; future sections in blue; unbuilt sections in orange
System information
	Maintained by SCDOT
Length	862.60 mi (1,388.22 km)
Formed	June 29, 1956
Highway names
Interstates	Interstate XX (I-XX)
Business Loop:	Interstate XX Business Loop (I-XX Bus.)
Business Spur:	Interstate XX Business Spur (I-XX Bus.)
System links
	South Carolina State Highway System; Interstate; US; State; Scenic;

There are 11 Interstate Highways—5 primary and 6 auxiliary—that exist entirely or partially in the U.S. state of South Carolina. As of December 31, 2013, the state had a total of 850.80 miles (1,369.23 km) of interstate and 11.80 miles (18.99 km) of interstate business, all maintained by the South Carolina Department of Transportation (SCDOT).^[2]

Primary Interstates


Number	Length (mi)^[3]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-20	141.51	227.74	I-20 at the GA state line	I-95 / I-20 Bus. in Florence	01964-01-011964	current
I-26	220.95	355.58	I-26 at the NC state line	US 17 in Charleston	01960-01-011960	current
I-73	—	—	US 17 in Briarcliffe Acres	Future I-73 at the NC state line	proposed	—	Future designated along SC 22.
I-74	—	—	Future I-74 at the NC state line	US 17 in Garden City	proposed	—	Future designated along SC 31.
I-77	91.05	146.53	I-26 in Cayce	I-77 / US 21 at the NC state line	01975-01-011975	current
I-85	106.28	171.04	I-85 at the GA state line	I-85 at the NC state line	01959-01-011959	current
I-95	198.76	319.87	I-95 at the GA state line	I-95 at the NC state line	01968-01-011968	current
Proposed and unbuilt


Number	Length (mi)^[4]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-126	3.680	5.922	I-26 / US 76 in Columbia	US 21 / US 76 / US 176 / US 321 in Columbia	01961-01-011961	current
I-185	17.7	28.5	I-385 in Mauldin	US 29 in Greenville	01961-01-011961	current	Toll road between I-385 and I-85.
I-326	5.24	8.43	I-26 in Cayce	SC 48 in Columbia	01976-01-011976	01995-01-011995^[5]	Was an unsigned designated route, replaced by I-77.
I-385	42.16	67.85	I-26 near Clinton	US 276 in Greenville	01962-01-011962	current
I-520	7.72	12.42	I-520 at the GA state line	I-20 in North Augusta	02004-01-012004	current
I-526	19.26	31.00	US 17 / SC 7 in Charleston	I-526 Bus. / US 17 in Mount Pleasant	01989-01-011989	current
I-585	2.25	3.62	US 176 / US 221 / SC 9 in Spartanburg	I-85 Bus. / US 176 near Spartanburg	01959-01-011959	current
Former


Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-20 BS	2.110	3.396	I-20 / I-95 in Florence	US 76 Conn. / West Evans Street in Florence	01970-01-011970	current
I-85 BL	8.770	14.114	I-85 northwest of Fairforest	I-85 east of Valley Falls	01995-01-011995	current	Freeway-grade business loop
I-126 BS	0.60	0.97	I-126 / US 21 / US 76 / US 176 / US 321 in Columbia	US 21 / US 76 / US 176 / US 321 in Columbia	01980-01-011980	—
I-385 BS	0.490	0.789	I-385 / US 276 in Greenville	US 29 / SC 183 in Greenville	01962-01-011962	current	Unsigned business spur
I-526 BS	1.570	2.527	I-526 / US 17 in Mount Pleasant	SC 703 in Mount Pleasant	01992-01-011992	current
I-585 BS	1.60	2.57	US 29 / US 176 / SC 9 in Spartanburg	I-585 / US 176 / US 221 / SC 9 in Spartanburg	01959-01-011959	—
Former

^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Vol. 60, no. 1. Washington, DC: Federal Highway Administration. ISSN 0033-3735. Retrieved March 16, 2012.
^ Starks, Edward (January 27, 2022). "Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 23, 2023.
^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 23, 2023.
^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 23, 2023.
^ Special Committee on U.S. Route Numbering (April 23, 1995). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 16, 2017. Retrieved May 19, 2013.