| State: | UT |
| Type: | SR |
| Route: | 142 |
| Section: | 120 |
| Map Custom: | yes |
| Length Mi: | 17.353 |
| Length Round: | 3 |
| Length Ref: | [1] |
| Established: | 1933[2] |
| Direction A: | South |
| Terminus A: | in Newton |
| Direction B: | East |
| Terminus B: | in Richmond |
| Previous Type: | SR |
| Previous Route: | 141 |
| Next Type: | SR |
| Next Route: | 143 |
State Route 142 (SR-142) is a state highway in the U.S. state of Utah. At 17.3miles long, it connects the towns of Newton, Clarkston, Trenton, and Richmond to US-91 and SR-23 in northern Cache County.
The route starts at its intersection with SR-23 in Newton and travels about 5miles northwest to Clarkston. Here the route turns east and travels just over 12miles through Trenton and ends in Richmond at the intersection with US-91.
The state legislature created State Route 142 in 1933, connecting SR-69 (now SR-30) at Petersboro with Newton and Smithfield.[2] SR-142 was moved to the present route of Newton to Clarkston at SR-170 in 1941, with the old alignment through downtown Newton to Smithfield becoming SR-218.[3]
In 1969, SR-170, which ran from Clarkston via Trenton to Richmond was absorbed into SR-142, and SR-170 was deleted. This completed the current route of SR-142 as it runs today.