The "northern route" is numbered 899 in the national highway numbering system.

At that time the route was numbered 25, and later 125.

These routes are numbered as 1** and 2** where ** represents the two numbers of the regular route service.

Until around 1967, the route was numbered 82.

The original route is now numbered the D 931.

The current route was numbered NC 128 on or around 1947.

All open top routes were numbered in the 40-series.

The routes are numbered 101-106, and are designated with a color.

These routes are numbered between 59 and 65.

This new route had already been numbered U.S. 30 in late 1926.