Route 126 is a highway located entirely within Barton County in the U.S. state of Missouri.

Its western terminus is at the Kansas state line, where K-126 ends.

Route 126 starts at the Kansas state line, where K-126 ends.

The road crosses over North Fork Spring River and continues east.

The routes goes through downtown Golden City, and turn slightly northeast.

[7][8] A year later, Route H was extended west to the Kansas state line.