The Maryland automobile was built by the Sinclair-Scott Company of Baltimore, Maryland, between 1907 and 1910.
Sinclair-Scott was a maker of food canning machinery and in the early 1900s started to make car parts. One of their customers, Ariel, failed to pay and in recompense Sinclair-Scott took over production, moved the factory to Baltimore, and marketed the car as the Maryland.
The car was powered by a 30-hp four-cylinder, overhead camshaft engine. The Ariel design was initially unchanged, and the Maryland was originally available as a four-seat roadster or a five-seat touring car. The wheelbase was later lengthened from the initial to . Limousines became available in 1908 and town cars in 1909. Prices ranged from $2,500 to $3,200, ().
Production stopped in 1910 after 871 Marylands had been made, as producing the cars was not profitable. The company returned to the manufacture of food-canning machinery.