Arlington County is a county in the Commonwealth of Virginia. The county is situated in Northern Virginia on the southwestern bank of the Potomac River directly across from the District of Columbia, of which it was once a part, under the name Alexandria County.The county is coextensive with the U.S. Census Bureau's census-designated place of Arlington. ...

Mount Arlington is a borough in Morris County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 5,050, ... As of 2021, Morris County's Commissioners are Commissioner Director Stephen H. Shaw (R, Mountain Lakes, 2021), ...