MD 24 from Bush's Corner toward Fawn Grove began construction in 1926. The concrete highway was completed to St. Marys Road by 1927 and to Five Forks in 1928. The third section, from Five Forks to about south of the state line, was started in 1929 and completed in 1930. The final section to the state line at Fawn Grove was started in 1930 and completed by 1933. Around the time the highway was completed, MD 24 was switched from Pylesville Road to Rocks Road north of Bush's Corner; MD 165 was extended from Bush's Corner to Cardiff in MD 24's stead. MD 24 received a new bridge over Deer Creek within Rocks State Park in 1934. Since the 1930s, the only notable improvement to the original length of MD 24 was the construction of the roundabout at the MD 24 – MD 165 intersection in 2000.