Baltimore County is the third-most populous county in the U.S. state of Maryland. It is part of the Baltimore metropolitan area.

The Baltimore–Columbia–Towson Metropolitan Statistical Area, also known as Central Maryland, is a metropolitan statistical area (MSA) in Maryland as defined by the United States Office of Management and Budget (OMB). It is part of the larger Washington–Baltimore combined statistical area. As of 2022, the combined population of the seven counties is 2,985,871, making it the 20th-largest metropolitan statistical area in the nation.