[4] State Route 63 extended south along current secondary SR 758 from US 58 between Beech Spring and Jonesville across the Powell River on Flanary Bridge to the Tennessee state line, continuing as an unnumbered county road in the direction of Tennessee State Route 63 at Mulberry Gap.

[14] State Route 73 followed present secondary SR 619 from US 23 (now US 23 Business) at the intersection of Main Avenue and 12th Street in Norton[18] south past High Knob to the Wise-Scott County line in the direction of Fort Blackmore.

Most of the route was added to the state highway system in 1932, with no number given,[19] and assigned SR 73 in the 1933 renumbering.

[3] SR 73 was extended the remaining 0.4 miles (0.64 km) to the county line (replacing SR 619,[14] which continued to exist in Scott County[20]) in 1937,[21] but in 1948 it was downgraded to secondary effective completion of ongoing construction work,[22] for which the contract was awarded in November 1948.

3.24 miles (5.21 km) of road from Bristol towards Kings Mill (now Cleveland, southwest of Green Spring) were added to the state highway system in 1928 as State Route 109,[28] but in reality the route left King Mill Pike about 2 miles (3.2 km) out of Bristol, turning northeast on Old Airport Road.

[3] An extra 3⁄4 mile (1.2 km) was added in 1934,[31] but the 1932 official Washington County map shows that the route was already complete.

[39] The route was added to the state highway system in 1932, with no number given,[40] and became SR 75 in the 1933 renumbering.

[39] State Route 78 extended southeast from SR 61 at Gratton along present secondary SR 623 in Bland and Tazewell counties (the old Tazewell Courthouse and Fancy Gap Turnpike[citation needed]) over Rich Mountain and into Burkes Garden, ending about 1⁄4 mile (0.40 km) short of SR 625.

The first 1.9 miles (3.1 km) out of Chilhowie were added to the state highway system in 1930 as State Route 135,[48] which was extended another 2.1 miles (3.4 km) to St. Clair Bottom in 1931[49] and became SR 79 in the 1933 renumbering.

It was added to the primary system in 1934, on new alignment that connected a realigned US 21 to what was then part of SR 644,[54][62] and downgraded to secondary in 1942.