The following highways are numbered 704:
| Preceded by 703 | Lists of highways 704 | Succeeded by 705 |
State Route 704 is a state highway located entirely in Pierce County, Washington, United States. It is intended to provide access between Interstate 5 (I-5) and SR 7 by passing through a portion of Joint Base Lewis–McChord, a major U.S. military installation. The designated route comprises a short, 0.6-mile (0.97 km) section near SR 7 in Spanaway. The full 6-mile (9.7 km) highway is estimated to cost $480 million to construct, but remains unfunded.
Maryland Route 704 is a state highway in the U.S. state of Maryland. Known as Martin Luther King Jr. Highway, the highway runs 6.53 miles (10.51 km) from Eastern Avenue at the District of Columbia boundary in Seat Pleasant east to MD 450 in Lanham. MD 704 is a four- to six-lane divided highway that connects the northern Prince George's County communities of Seat Pleasant, Landover, Glenarden, and Lanham. The highway was constructed along the right of way of the abandoned Washington, Baltimore and Annapolis Electric Railway (WB&A) in the early 1940s. In the late 1950s and early 1960s, MD 704 served as a temporary routing of U.S. Route 50 while the U.S. Highway's freeway was under construction from Washington to Lanham. The route was expanded to a divided highway between Seat Pleasant and US 50 in the late 1960s and early 1970s. MD 704 was completed as a divided highway when the portion east of US 50 was expanded in the late 1990s.
King's Highway 109, or Highway 109, is a former provincial highway in Ontario. It was used on two separate, unrelated routes during the 1950s and 1960s:
North Carolina Highway 772 (NC 772) is a primary state highway in the U.S. state of North Carolina. NC 772 is a two-lane rural highway that traverses 10.3 miles (16.6 km) from U.S. Route 311 (US 311) north of Pine Hall to NC 704 in Prestonville.
North Carolina Highway 704 (NC 704) is a primary state highway in the U.S. state of North Carolina. The highway connects Madison with northern Stokes County and the Wentworth-Reidsville area.
Secondary Highway 500, commonly referred to as Highway 500, was a secondary highway in the Canadian province of Ontario which was first designated in 1956. Its route was renumbered in 1964, becoming:
Secondary Highway 514, commonly referred to as Highway 514, was a secondary highway in the Canadian province of Ontario. It was used on two separate routes from the 1950s to the 1990s:
