State Route 186 (SR 186) is a sixteen-mile-long (26 km) state highway in south central Maine.

The highway serves the town of Gouldsboro, running in a half-loop from U.S. Route 1 (US 1), south and east along the southern coast to Winter Harbor near Frenchman Bay, and then returning to US 1.

[2] The entire route is in Hancock County.

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