Carroll County is a county located in the U.S. state of Maryland. As of the 2010 census, the population was 167,134. Its county seat is Westminster.
Carroll County is a part of the Baltimore metropolitan area and the Baltimore-Washington Metropolitan Area. While predominantly rural, the county has become increasingly suburban in recent years.
The Carroll family of Maryland is a prominent political family in the History of the United States, or, more correctly, a group of distantly related families.
Of Irish descent, the Carrolls have their origins in the ancient kingdom of Éile, commonly anglicized Ely, as a branch of the ruling O'Carroll family.
Charles Carroll (September 19, 1737 – November 14, 1832), known as Charles Carroll of Carrollton or Charles Carroll III to distinguish him from his similarly named relatives, was a wealthy Maryland planter and an early advocate of independence from Great Britain. He served as a delegate to the Continental Congress and Confederation Congress and later as first United States Senator for Maryland. He was the only Catholic and the longest-lived (and last surviving) signatory of the Declaration of Independence, dying at the age of 95, at his city mansion (largest and most expensive in town) in Baltimore's neighborhood of Jonestown on East Lombard and South Front Streets, by the Jones Falls.