Carroll County is a county located in the U.S. state of Maryland. Its county seat is Westminster.

Carroll County is included in the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area, which is also included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. While predominantly rural, the county has become increasingly suburban in recent years.

The county is governed by a seven-member Board of County Commissioners, which is elected from seven districts. The county is part of the 5th Congressional District of Maryland and is represented in the Maryland General Assembly by three delegates and three senators.

The county is home to several state parks, including Piney Run Park, Hashawha Environmental Center, and the Liberty Reservoir. The Liberty Reservoir is the largest body of water in the county and is a popular destination for fishing, boating, and other recreational activities.

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