State Route 270 is a short north–south thoroughfare that sits completely within Salt Lake City in Salt Lake County, entirely along West Temple Street. The southern terminus is at 900 South, with ramps to an from I-15/I-80 at exit 305D; its northern terminus is at US-89 (400 South, formerly SR-186).

After its southern terminus, SR-270 heads north for its entire course, having a dual intersection with SR-269, one eastbound and one westbound. Afterwards it terminates at US-89.

The State Road Commission designated SR-270 in 1960 as a branch from proposed I-15 to SR-176 (900 South) at West Temple Street. In 1969, the state legislature extended it north to SR-186 (400 South, now US-89).

The entire route is in Salt Lake City, Salt Lake County.

List of state highways in the United States shorter than one mile