Barton City is an unincorporated community in Alcona County in the U.S. state of Michigan. It is situated about 2 miles north of M-72 in the Huron National Forest on the shore of Jewel Lake. Most of the community is within Millen Township, although nearby settlement extends north into Hawes Township. The ZIP code, 48705, serves a much larger area including large portions of Millen, Hawes, and Mitchell Township.