There are five business routes of Interstate 8.
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El Cajon loop
Business Loop 8 (BL-8) begins as Main Street at an interchange with I-8, loosely paralleling the freeway on the northern side. The loop passes through Bostonia and Lakeview before ending at the Lake Jennings Park Road interchange with I-8.
El Centro loop
Business Loop Interstate 8 (BUS-8) is a business loop route that diverges from Interstate 8 in El Centro, California to pass through the downtown area. Business Interstate 8 originates and terminates with I-8 and acts as a direct link to El Centro as I-8 bypasses the downtown area.
BUS-8's path through El Centro traces roughly three sides of a rectangle with I-8 constituting the fourth side. BUS-8 begins at its western terminus with I-8 by going north along Imperial Avenue. When BUS-8 reaches the intersection of Adams Avenue it turns east along that road. Along this stretch, BUS-8 is joined by State Route 86 (SR-86) which approaches from the north along Imperial Avenue, and by Imperial County Route S80 which approaches from the west along Adams Avenue. The three routes continue joined as Adams Avenue ends and turns south along Fourth Avenue where S80 then turns to continue east. BUS-8 and SR-86 continue south running concurrent until BUS-8 reaches its eastern terminus with I-8.
Only the portion of BUS-8 that runs concurrently with SR-86 is maintained by the state. Along its concurrency with SR-86, BUS-8 is designated as part of the Juan Bautista de Anza National Historic Trail.
Winterhaven/Yuma loop
Business Loop 8 (BL-8) begins at an interchange with I-8 and Winterhaven Drive in Winterhaven, California. The loop continues east, paralleling I-8 to the north and running concurrently with CR S24. BL-8 then goes through downtown Winterhaven before CR S24 continues east and BL-8 continues south, crossing I-8 again as well as the Colorado River into Yuma, Arizona. Passing to the west of Yuma Quartermaster Depot State Historic Park, BL-8 goes through downtown Yuma as South Fourth Avenue, intersecting US-95 after several blocks. The business loop curves to the east as East 32nd Street, passing along the north side of Yuma International Airport and the south side of the Yuma Conservation Garden. East of the airport, BL-8 passes through less-developed areas of eastern Yuma before ending at I-8.
Gila Bend loop
Business Loop I-8 (BL-8) begins at an interchange with I-8 west of Gila Bend before passing under the freeway, continuing east and merging with SR-85 at a truck stop. As Pima Street, the two highways continue through downtown Gila Bend before BL-8 turns south away from SR-85 as Butterfield Trail and ending at I-8 at a diamond interchange.