The road runs as a two-lane highway its entire length of 16 miles (26 km) and is marked as Historic Route 66.

In 12.5 miles (20.1 km), Route 266 deviates from old US 66 in a project to improve access to Springfield-Branson Regional Airport.

[clarification needed] For 1 mile (1.6 km), the route follows the new roadway.

The westernmost section (which passed through Paris Springs Junction and Spencer) would be turned into county roads.

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