With the help of Rockville-based multiple-listing service MRIS, we compiled a list of some of the most expensive houses for sale in the Washington area.

This month, the most expensive new listings include a nearly 20,000-square-foot home in Potomac, Md.; a nine-bathroom home in the District; and two Virginia farms.

The 511-acre Tamworth Farm on Tamworth Farm Lane in Aldie, Va., is listing for $25 million. (Upward Studio)

Tamworth Farm Lane, Aldie, Va.
$25 million
Agent: Linda Culbert, Long & Foster Real Estate

Tamworth Farm, off Route 15 between Leesburg and Gilberts Corner, includes 16 parcels of land that total more than 511 acres. The farm has a main residence built in the 1820s, burned during the Civil War and rebuilt in the 1940s with the original stone. In addition, the property has a second residence, which is a renovated historic farmhouse with a swimming pool. The property also has three guesthouses, barns, stables, paddocks, an indoor riding arena, ponds, a tennis court, a second swimming pool, and streams and a river running through the grounds.

The 19,700-square-foot custom-designed home at 9300 River Rd. in Potomac, Md., is listing for $10.8 million. (HomeVisit)

9300 River Rd., Potomac, Md.
$10.8 million
Agent: Nancy Itteilag, Washington Fine Properties

Built in 2006, this custom-designed home constructed by Niro Builders has 19,700 finished square feet on a 2.85-acre lot. The house includes formal and informal spaces for entertaining and has nine bedrooms, 12 bathrooms, six fireplaces and a four-car garage. The landscaped grounds include a swimming pool.

The 100-acre estate at 36987 Mountville Rd. in Middleburg, Va., is listing for $10 million. (Megan Witt Photography)

36987 Mountville Rd., Middleburg, Va.
$10 million
Agents: Mary Ann and Brian McGowan, Thomas and Talbot Real Estate

This stone manor rests on a 100-acre estate with an additional 227 acres available for sale. The main residence, built in 1925 and recently restored, includes six bedrooms, six bathrooms, 11 fireplaces and a three-car garage. The grounds include a heated pool surrounded by a flagstone terrace, lawns, gardens, a stable, a riding ring and caretakers’ apartments.

The 12,000-square-foot six-bedroom, eight-bathroom home at 13768 Balmoral Greens Ave. in Clifton, Va., is listing for $7.495 million. (Sean Shanahan)

13768 Balmoral Greens Ave., Clifton, Va.
$7.495 million
Agent: Jeff Wilson, TTR Sotheby’s International Realty

This 13-acre estate, built by architect Mark Kohler with interior designs by Barry Darr Dixon, is being sold fully furnished. The 12,000-square-foot main residence has six bedrooms, eight bathrooms, six fireplaces and a four-car garage. The grounds include a carriage house for guests, a pool and pool house, a stable, a sport court and a screened pavilion.

The 9,400-square-foot waterfront home at 8214 Lazy Point Lane in Lorton, Va., is listing for $6.9 million. (Blue Sky Media)

8214 Lazy Point Lane, Lorton, Va.
$6.9 million
Agent: Windy Harris, Hunt Country Sotheby’s International Realty

This waterfront property encompasses nine acres of a peninsula on the lower Occoquan River with views across the Potomac River to Maryland. The property includes a registered heliport, a tennis court and nearly 7,000 square feet of wood decks. The house, built in 1976, has approximately 9,400 square feet with four bedrooms, five bathrooms, three fireplaces and a five-car garage.

The five-bedroom, four-bathroom Lafayette House, built in 1815, at 301 St. Asaph St. in Alexandria, Va., is listing for $6.8 million. (Bob Narod)

301 St. Asaph St., Alexandria, Va.
$6.8 million
Agent: Kate Patterson, McEnearney Associates

Known as the Lafayette House, where the Marquis de Lafayette stayed in 1824, this Old Town Alexandria home was built in 1815. The house, which has five bedrooms and four bathrooms, has many original features such as a front-door arch, grand entry hall, heart pine flooring and 12-foot-high ceilings. The residence has 11 fireplaces with period mantels, a walled garden and off-street parking.

The six-bedroom, 10-bathroom Ballantrae Farms estate at 1173 Dolley Madison Blvd. in McLean, Va., is listing for $5.7 million. (HomeVisit)

1173 Dolley Madison Blvd., McLean, Va.
$5.7 million
Agent: Fouad Talout, Long & Foster Real Estate

This Ballantrae Farms estate, built in 1985, rests on just over an acre and includes six bedrooms and 10 bathrooms. The house has an elevator, a library with a music alcove, a bar and two separate home offices, along with a formal living room, a formal dining room, a kitchen, a great room and a catering kitchen for entertaining. The home has marble and hardwood flooring, and the grounds include a deck and a new swimming pool with a pool house.

The seven-bedroom, nine-bathroom custom-built home at 2170 Dunmore Lane NW in Washington is listing for $4.995 million. (HomeVisit)

2170 Dunmore Lane NW, Washington
$4.995 million
Agent: Eileen McGrath, Washington Fine Properties

Custom-built in 2009, this property includes a heated saltwater pool, a veranda, a terrace and mature landscaping. Inside, the home has seven bedrooms, nine bathrooms, two fireplaces and a two-car garage. The home has a family room with a coffered ceiling, a library, a formal dining room, a formal living room and a spacious kitchen and breakfast area. Many of the rooms have French doors and floor-to-ceiling windows.

The 5,330-square-foot home at 3001 44th Pl. NW in Washington’s Wesley Heights section is listing for $4.35 million. (Sean Shanahan)

3001 44th Pl. NW, Washington
$4.35 million
Agents: Christie-Anne Weiss and Christopher Ritzert, TTR Sotheby’s International Realty

This Wesley Heights home, built in 1926, has five bedrooms, seven bathrooms, a fireplace and 5,330 square feet. The main level includes a living room with a fireplace, a library, and a sunroom leading to the back yard. The master bedroom has a private terrace overlooking the back yard. The grounds include a swimming pool, gardens and a 910-square-foot, two-bedroom guest cottage built in 2008.

The 11,000-square-foot six-bedroom, nine-bathroom Georgian Colonial at 8507 Country Club Dr. in Bethesda, Md., is listing for $4.295 million. (HomeVisit)

8507 Country Club Dr., Bethesda, Md.
$4.295 million
Agents: Marc Fleisher and Lee Arrowood, TTR Sotheby’s International Realty

Built in 2003, this Georgian Colonial-style home has more than 11,000 finished square feet, including six bedrooms, nine bathrooms and six fireplaces. The home has a large kitchen, family room and breakfast room, a wood-paneled library and a finished lower level with a kitchen, a media room, an exercise room, a game room and a full bar. The two-acre lot includes a swimming pool with a pool house.