Interstate 84 Business Loop (I-84 BL) is a 5.7354-mile (9.2302 km) northern business loop off of I-84 in Box Elder County, Utah, that passes through Tremonton and Elwood.

[1][2] I-84 BL begins along Utah State Route 102 (SR-102) at a diamond interchange on I-84 (exit 40) in Tremonton.

(I-84 heads west toward Snowville in Utah and then on to Twin Falls and Boise in Idaho.

From its western terminus, I-84 BL proceeds east along West Main Street, concurrent with SR-102, to pass under I-15 and then along the south edge of the Box Elder County Fairgrounds before reaching its junction with I-15 BL at 1000 West (Iowa String Road) on southeast corner of the fairgrounds.

(I-15 / I-84 heads north and west toward Tremonton, Riverside, and Snowville in Utah and then on to Malad City, Pocatello, and Twin Falls in Idaho.