Massac is a census-designated place (CDP) in McCracken County, Kentucky, United States.

U.S. Route 62 (Blandville Road) serves as the border between Massac and Paducah.

The unincorporated community of Lone Oak, centered on US 45, is split between the two CDPs.

[1] The CDP's western boundary follows Massac Creek, a north-flowing tributary of the Ohio River.

21.9% of all households were made up of individuals, and 7.0% had someone living alone who was 65 years of age or older.