The Baltimore County Union was a weekly newspaper published in Towsontown, Baltimore, Maryland from January 7, 1865 to June 8, 1912. When John H. Longnecker combined his pro-Union paper, the Baltimore County American, with the Baltimore County Advocate to create The Baltimore County Union, he placed his sons Henry and John in charge of the new weekly. Its inaugural issue claimed that it had the "largest circulation of any county paper in the State." The publication's main competitor in Towsontown was the Maryland Journal, a Democratic paper run by William H. Ruby.