The road runs through town on a southeast course, paralleling a rail line.

[5] SH-270 continues east for one mile (1.6 km) until it crosses into Pottawatomie County, where the name of the road changes to Oklahoma Street.

After leaving McLoud, it then turns back to the southeast, parallel to the same railroad it ran alongside in Harrah.

[6] On March 5, 1979, US-270 was rerouted to run concurrent with Interstate 40 from south of Calumet in Canadian County through the Oklahoma City metro, exiting the Interstate onto a surface alignment in Shawnee.

The realignment of US-270, with SH-270 on the old alignment between Harrah and Shawnee, appears on the 1979 state map.