Mexico is an unincorporated community and census-designated place (CDP) in Jefferson Township, Miami County, in the U.S. state of Indiana.

[7] Mexico was established along an Indian trail bordering the Eel River.

Sitting along the Michigan Road was the River House Inn, owned by the parents of Indiana poet Dulciana Minerva Mason, which was at the time the only stopping point between Indianapolis and Michigan City.

The center of the community is 0.7 miles (1.1 km) east of U.S. Route 31, which forms the western border of the CDP.

Peru, the Miami county seat, is 5 miles (8 km) to the southeast via North Mexico Road.

About 2.9% of families and 5.1% of the population were below the poverty line, including none of those under the age of eighteen or sixty-five or over.