* July 16 – The signing of the Residence Bill establishes a site along the Potomac River as the District of Columbia, the capital district of the United States

* Potomac District

While the Aquia and Potomac Districts ceased to exist by the spring of 1862, the need remained for military organization in the Valley throughout the remainder of the war, and the Valley District remained in place for the duration of the war.

The Department comprised three districts: Aquia District, Potomac District, and the Valley District.

* From 1801 to 1802, the District of Columbia and pieces of Maryland and Virginia formed the United States District Court for the District of Potomac, which was the first United States district court to cross state lines.

Formed from land along the Potomac River that the states of Maryland and Virginia ceded to the federal government of the United States in accordance with the Residence Act, the territory that became the original District of Columbia was a square measuring on each side, totaling.

U. S. 1 crosses the Potomac River with I-395 on the 14th Street Bridges, and splits to follow mainly 14th Street and Rhode Island Avenue through the District of Columbia.

The current Vice-Chairman is Maureen S. Caddigan, the Potomac District Supervisor.

Further, the unincorporated area within the District was organized into two counties: the County of Washington to the east of the Potomac and the County of Alexandria to the west.

* Potomac School District

Conococheague, the name of the creek that flows through the District on its way from the Path Valley south to the Potomac River, is an Indian name from the Delaware Tribe meaning clear water.

Woodbridge is a census-designated place and magisterial district of Prince William County, Virginia, United States, located south of Washington, D. C .. Bounded by the Occoquan and Potomac rivers, Woodbridge Magisterial District had 54, 275 residents at the 2010 census.

Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia: U. S. Geological Survey Professional Paper 1691, 2008.

The eastern part of the airport was constructed in the District of Columbia on and near mudflats that were within the tidal Potomac River near Gravelly Point, about from the United States Capitol, using landfill dredged from the Potomac.

After his time as Attorney General, he became the port officer for the District of the Potomac and among the most prominent trial lawyers in Northern Virginia and the District of Columbia.

When completed it allowed boats and rafts to float downstream towards Georgetown, a major port of the time on the Potomac River, now in the District of Columbia.

The land flattens out after it crosses the Shenandoah Mountains east of Winchester, and it follows the old Little River Turnpike from Aldie to Fairfax and the newer Arlington Boulevard to Rosslyn, where it crosses the District of Columbia line on the west shore of the Potomac River and joins Interstate 66 on the Roosevelt Bridge.

* Interstate Commission on the Potomac River Basin ( Maryland, West Virginia, Virginia, Pennsylvania, and District of Columbia )

Potomac Council serves Scouts in Maryland and West Virginia.

Potomac Council serves youth in Allegany and Garrett Counties, Maryland and Mineral, Hampshire, Hardy, and Grant Counties, West Virginia.

Groveton High School, which served the community since 1959, was renamed in the mid-1980s as West Potomac High School, which also serves Fort Hunt.

Keyser is the home of the Potomac State College of West Virginia University, a junior college that serves primarily as a feeder college to WVU's main campus in Morgantown.

The station serves a dense residential area of Southeast Washington around Potomac Avenue and is located at 14th and G Streets.

After crossing the Potomac, I-95 / I-495 immediately meets the southern terminus of Interstate 295, known as the Anacostia Freeway, a route that serves downtown Washington to the north, connecting in Washington to Interstate 395.

The question of the constitutionality of the formation of the new state was brought before the Supreme Court of the United States in the following manner: Berkeley and Jefferson County, West Virginia, counties lying on the Potomac east of the mountains, in 1863, with the consent of the Reorganized Government of Virginia, had supposedly voted in favor of annexation to West Virginia.

John Howard and his son also passed through present-day Berkeley County a few years later, and discovered the valley of the South Branch Potomac River at Green Spring.

In 1730, John Van Meter, with his brother Isaac ( 1692 – 1757 ), secured a patent for at the South Branch Potomac River, much of it located in present-day Berkeley County, from Virginia's Colonial Lieutenant Governor William Gooch.

During the American Civil War ( 1861 – 1865 ), Berkeley and Jefferson counties, both lying on the Potomac River east of the mountains, with the consent of the Reorganized Government of Virginia, voted in favor of annexation to West Virginia in 1863.

As the Winchester Pike, US 11 heads northeast for about through Berkeley County, passing through Inwood, Martinsburg, and Falling Waters before crossing the Potomac River into Maryland.

The question of the constitutionality of the formation of the new state was brought before the Supreme Court of the United States in the following manner: Berkeley and Jefferson counties, West Virginia, counties lying on the Potomac east of the mountains, in 1863, with the consent of the Reorganized Government of Virginia, had supposedly voted in favor of annexation to West Virginia.

Walker remained at the Berkeley Plantation until his promotion on August 11 to major and transferral with General Couch to the II Corps of the Army of the Potomac.

It flows into the Potomac northeast of Martinsburg in Berkeley County, West Virginia, and its source lies northwest of the community of Opequon at the foot of Great North Mountain in Frederick County, Virginia.

Back Creek is a tributary of the Potomac River that flows north from Frederick County, Virginia, to Berkeley County in West Virginia's Eastern Panhandle.

Separate formation called the I Corps served in the Army of the Ohio / Army of the Cumberland under Alexander M. McCook from September 29, 1862 to November 5, 1862, in the Army of the Mississippi under George W. Morgan from January 4, 1863 to January 12, 1863, and in the Army of the Potomac and Army of Virginia ( see below ).

Commanders often tried to procure specific breeds for their men, with the Morgan being a particular favorite within the Army of the Potomac.

From Frederick County, Sleepy Creek flows north through Morgan County, West Virginia, where it drains into the Potomac at the community of Sleepy Creek on the old Baltimore & Ohio Railroad mainline.

Throughout the Civil War, the Confederacy maintained a network of underground operators in southern Maryland, particularly Charles and St. Mary's counties, smuggling recruits across the Potomac River into Virginia and relaying messages for Confederate agents as far north as Canada.

Category: Potomac River counties

However, these counties lying on the Potomac River east of the mountains, with the consent of the Reorganized Government of Virginia supposedly voted in favor of annexation to West Virginia in 1863 in a dubious election supervised by the occupying Union Army.

Category: Potomac River counties

It is bounded on the north by Loudoun and Fairfax counties ; on the west by Fauquier County ; on the south by Stafford County ; and on the east by the Potomac River ( Charles County, Maryland lies across the river ).

By 1986, it became apparent that the jurisdictions outside of NVTC could not reach agreement on how to support VRE by joining NVTC so the Potomac and Rappahannock Transportation Commission was created for Prince William and Stafford counties and the city of Manassas.

89, divided Virginia into three judicial districts: the District of Virginia, which included the counties west of the Tidewater and south of the Rappahannock River ; the District of Norfolk, which included the Tidewater counties south of the Rappahannock ; and the District of Potomac, which included the counties north and east of the Rappahannock as well as Maryland counties along the Potomac.

It protects over of federally owned land within a proclamation boundary that includes much of the Potomac Highlands Region and portions of 10 counties.

* the Mount Vernon Trail and the Potomac Heritage Trail within George Washington Memorial Parkway in Arlington and Fairfax counties, Virginia.

* the Southern Maryland Potomac Heritage Trail Bicycling Route in Charles and St. Mary's counties in Maryland.

89, divided Virginia into three judicial districts: the District of Virginia, which included the counties west of the Tidewater and south of the Rappahannock River ; the District of Norfolk, which included the Tidewater counties south of the Rappahannock ; and the District of Potomac, which included the counties north and east of the Rappahannock as well as Maryland counties along the Potomac.