SR-231 begins at the intersection of State Street (US-89) and Milburn Road, proceeding north on the latter.

After slightly less than a city block, the route comes to its northern terminus at Canyon Road (SR-31).

The routes remained in this configuration until 1969, when SR-91 was removed from the state highway system in a mass deletion of minor state highways and transferred to local jurisdiction.

However, the short segment of former SR-91 between US-89 and SR-31 in Fairview continued to be used as the primary connection from northbound US-89 to eastbound SR-31, and vice versa.

As a result, in the meeting of the Utah Transportation Commission on October 12, 2018, this one-block segment was re-added to the state highway system as SR-231.