Sodexo is the foodservice provider for the House of Representatives, and the new location is part of its efforts to introduce new dining concepts for staff and guests at the building.
Au Bon Pain employs 16 team members and is located on the first floor of the Cannon House Office Building in room 194.
The restaurant offers signature items including sandwiches, breads, pastries, salads, soups and coffee at the new location.
Sodexo North America government CEO Brett Ladd said: “We are honoured to serve the hard-working members and staff at US House of Representatives and their guests.
“We hope the excitement around Au Bon Pain will make the fast-casual bakery café a popular dining destination at the Cannon House Office Building.
“We look forward to adding more well-known brands to give customers additional dining options.”
House chief administrator Philip G. Kiko said: “We are pleased to welcome Au Bon Pain as the latest addition to our on-campus eateries.
“This is the second of four new, permanent branded options the CAO is bringing to the House this year at the request of Members and staff who work long hours and need quality and convenient food options.”
Sodexo North America currently employs 160,000 people across 13,000 facilities in 50 US states and Canada.
Last month, Sodexo opened its first outlet of Crussh, a smoothie and healthy fast food retailer, at the City, University of London as part of the franchise partnership signed in May last year to open new outlets across the UK and Ireland.