Maryland Line is an unincorporated town in Baltimore County, Maryland, United States, located just south of the Mason–Dixon line below York County, Pennsylvania. It is accessible via exits 36 and 37 from I-83. In the 19th century, the community was known as "New Market," but the name was changed to avoid confusion with a town in Frederick County bearing the same name.

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Maryland Line, Maryland
Unincorporated town
View south along MD 45 entering Maryland Line
Maryland Line Location within the State of Maryland Show map of Maryland Maryland Line Maryland Line (the United States) Show map of the United States
Coordinates: 39°42′51″N 76°39′14″W
Country	United States
State	Maryland
County	Baltimore
Time zone	UTC-5 (Eastern (EST))
• Summer (DST)	UTC-4 (EDT)