Maryland Route 543

Maryland Route 543
Maryland Route 543 highlighted in red
Route information
Maintained by MDSHA
Length	19.08 mi[1] (30.71 km)
Existed	1933–present
Major junctions
South end	US 40 in Riverside
Major intersections	MD 7 in Riverside I-95 in Riverside MD 136 at Creswell MD 22 in Fountain Green US 1 in Hickory MD 440 at Ady MD 646 near Ady
North end	MD 165 in Pylesville
Location
Country	United States
State	Maryland
Counties	Harford
Highway system
Maryland highway system Interstate US State Scenic Byways
← MD 542 → MD 544

Maryland Route 543 (MD 543) is a state highway in the U.S. state of Maryland. The state highway runs 19.08 miles (30.71 km) from U.S. Route 40 (US 40) in Riverside north to MD 165 in Pylesville. MD 543 is a north–south highway through central Harford County that connects the communities of Creswell, Fountain Green, Hickory, and Ady with the county's four main east–west highways: US 40, Interstate 95 (I-95), MD 22, and US 1. MD 543 was originally constructed in the early 1930s from Hickory to north of Ady, where the highway followed part of what is now MD 646. The state highway swapped routes with MD 646 to end in Pylesville by 1946. MD 543 was extended south in three steps to MD 7 in the 1950s. The state highway was rerouted at its southern end when I-95 was constructed in the early 1960s and again when the highway's interchange with the Interstate was built in the early 1990s. MD 543 was extended south through Riverside to US 40 in the mid 1990s.