Washington County is located in the western part of the U.S. state of Maryland. As of the 2020 census, the population was 154,705. It is the most populous county in the Western Maryland region and its county seat is Hagerstown.
Frederick is a city in, and the county seat of, Frederick County, Maryland, United States. It is located at an important crossroads at the intersection of a major north–south Native American trail and east–west routes to the Chesapeake Bay, both at Baltimore and what became Washington, D.C., and across the Appalachian mountains to the Ohio River watershed. Frederick's population was 78,171 people as of the 2020 census, making it the second-largest incorporated city in Maryland behind Baltimore. It is a part of the Washington metropolitan area and the greater Washington–Baltimore combined statistical area.
Jefferson County is located in the Shenandoah Valley in the Eastern Panhandle of West Virginia. It is the easternmost county of the U.S. state of West Virginia. As of the 2020 census, the population was 57,701. Its county seat is Charles Town. The county was founded in 1801, and today is part of the Washington metropolitan area.
Braddock Heights is an unincorporated community and census-designated place (CDP) in Frederick County, Maryland, United States. The population was 2,608 at the 2010 census. The local ZIP codes are 21714 and 21703.
Middletown is a town in Frederick County, Maryland, United States. The population was 4,136 as of the 2010 census. Located in the Middletown Valley that stretches between the Catoctin Mountains on the east and South Mountain on the west, the town reportedly gained its name from its location midway between those ranges.
Thurmont is a town in Frederick County, Maryland, United States. The population was 6,935 at the 2020 census. The town is located in the northern part of Frederick County, approximately ten miles from the Pennsylvania border, along U.S. Highway 15. It is very close to Cunningham Falls State Park and Catoctin Mountain Park, the latter of which contains the presidential retreat of Camp David. Thurmont is also home to Catoctin Colorfest, an arts and crafts festival that draws in about 125,000 people each autumn.
Boonsboro is a town in Washington County, Maryland, United States, located at the foot of South Mountain. It nearly borders Frederick County and is proximate to the Antietam National Battlefield. The population was 3,779 at the 2020 census.
Point of Rocks is an unincorporated community and census-designated place (CDP) in Frederick County, Maryland. As of the 2010 census, it had a population of 1,466.
U.S. Route 340 is a spur route of US 40, and runs from Greenville, Virginia, to Frederick, Maryland. In Virginia, it runs north–south, parallel and east of US 11, from US 11 north of Greenville via Waynesboro, Grottoes, Elkton, Luray, Front Royal, and Berryville to the West Virginia state line. A short separate piece crosses northern Loudoun County on its way from West Virginia to Maryland.
Adamstown is an unincorporated community and census-designated place (CDP) in Frederick County, Maryland, United States. It is named for Adam Kohlenberg, a station agent and first town merchant who owned much of present-day Adamstown. As of the 2010 census, the Adamstown CDP had a population of 2,372.
Maryland Route 17 is a state highway in the U.S. state of Maryland. The state highway begins at the Virginia state line at the Potomac River in Brunswick, where the highway continues south as Virginia State Route 287. MD 17 runs 29.49 miles (47.46 km) north from the Brunswick Bridge to the Frederick–Washington county line near Wolfsville. The state highway serves as the main north–south highway of the Middletown Valley of western Frederick County. MD 17 connects Brunswick and Wolfsville with Rosemont, Burkittsville, Middletown, and Myersville. The state highway also connects those communities with the valley's main east–west highways, which include U.S. Route 340, US 40 Alternate, Interstate 70 (I-70), and US 40.
Monrovia is an unincorporated community and census-designated place (CDP) in Frederick County, in the U.S. state of Maryland. As of the 2020 census it had a population of 2,702.
Maryland Route 180 is a state highway in the U.S. state of Maryland. Known for most of its length as Jefferson Pike, the state highway runs 14.95 miles (24.06 km) from U.S. Route 340 in Knoxville east to Ballenger Creek Pike and Interstate 70 (I-70) in Frederick. MD 180 is the old alignment of US 340 through Knoxville, Petersville, and Jefferson in the Middletown Valley of western Frederick County. The state highway was originally constructed in the early 1910s and designated US 340 in 1927. MD 180 was assigned to the highway bypassed by the US 340 freeway between Sandy Hook in far southern Washington County and Jefferson in the mid-1960s. The state highway was extended east to Frederick and south along Ballenger Creek Pike after the US 340 freeway was completed in the late 1960s. MD 180 was rolled back to Frederick and removed from Washington County in 1989.
U.S. Route 15 (US 15) is a part of the United States Numbered Highway System that runs from Walterboro, South Carolina, north to Painted Post, New York. In Maryland, the highway runs 37.85 miles (60.91 km) from the Virginia state line at the Potomac River in Point of Rocks north to the Pennsylvania state line near Emmitsburg. Known for most of its length as Catoctin Mountain Highway, US 15 is the primary north–south highway of Frederick County. The highway connects the county seat of Frederick with Point of Rocks, Leesburg, Virginia, and Charles Town, West Virginia, to the south and with Thurmont, Emmitsburg, and Gettysburg, Pennsylvania, to the north. US 15 is a four-lane divided highway throughout the state except for the portion between the Point of Rocks Bridge and the highway's junction with US 340 near Jefferson. The highway is a freeway along its concurrency with US 340 and through Frederick, where the highway meets US 40 and Interstate 70 (I-70). US 15 has a business route through Emmitsburg.
Downsville is an unincorporated community and census-designated place (CDP) in southwestern Washington County, Maryland, United States. Its population was 355 as of the 2010 census. It is located southeast of Williamsport on Maryland Route 63 and on Maryland Route 632, southwest of Hagerstown. It is officially included in the Hagerstown Metropolitan Area.
The Hagerstown–Martinsburg metropolitan area, officially designated by the United States Office of Management and Budget (OMB) as Hagerstown–Martinsburg, Maryland–West Virginia Metropolitan Statistical Area (MSA), constitutes the primary cities of Hagerstown, Maryland; Martinsburg, West Virginia; and surrounding areas in three counties: Washington County, Maryland; Berkeley County, West Virginia; and Morgan County, West Virginia. The metro area lies mainly within the rich, fertile Cumberland and Shenandoah valleys, and is approximately a 60–90 minute drive from Washington, D.C.; Baltimore, Maryland; and Harrisburg, Pennsylvania; Hagerstown is approximately 75 miles (121 km) driving distance from all three cities. The population of the metropolitan area as of 2008 is 263,753.
Libertytown is an unincorporated community and census-designated place (CDP) in Frederick County, in the U.S. state of Maryland. As of the 2010 census it had a population of 950. The Abraham Jones House was listed on the National Register of Historic Places in 1973.
Sabillasville is an unincorporated community and census-designated place in Frederick County, Maryland, United States. As of the 2010 census it had a population of 354.
Mapleville is an unincorporated community and census-designated place in eastern Washington County, Maryland, United States. Its population was 243 as of the 2020 census. It is officially a part of the Hagerstown Metropolitan Area.
Maryland Route 383 is a state highway in the U.S. state of Maryland. Known as Broad Run Jefferson Road, the state highway runs 5.48 miles (8.82 km) from MD 180 in Jefferson north to MD 17 near Burkittsville. MD 383 was built in four sections from MD 17 toward Jefferson between 1929 and 1953.
United States
Maryland 
Frederick 
