MD 675B, which is signed as MD 675 as known as Bi-State Boulevard, runs 2.09 miles (3.36 km) within northern Wicomico County from US 13 north of Salisbury north to DE-MD 54 at the Delaware state line in the twin towns of Delmar, Maryland, and Delmar, Delaware.

[1] MD 675 begins at a directional intersection with US 13 (Ocean Highway) south of Princess Anne.

MD 675 heads north as a two-lane undivided road into the town of Princess Anne, closely paralleling the Delmarva Central Railroad's Delmarva Subdivision rail line through a residential area.

At Park Drive, the state highway veers away from the railroad and into the Princess Anne Historic District.

[1][2] MD 675 crosses the Manokin River into a residential neighborhood that contains Manokin Presbyterian Church and the Somerset County Office Complex, reaching an intersection with the eastern terminus of MD 362 (Mt.

The state highway heads west from the perpendicular intersection, then turns north onto two-lane undivided Bi-State Boulevard, passing through a mix of farmland, forest, and residences.

[4] MD 675 north of MD 529 was constructed in 1933 as part of a relocation of US 13 between Princess Anne and Fruitland to bypass the circuitous route via Loretto Road and Allen Road and to eliminate two railroad crossings.

[5][6] MD 675 south of Park Drive was constructed as part of a similar relocation between Princess Anne and Westover in 1935.