Newmanstown is an unincorporated community and census-designated place (CDP) in Millcreek Township, Lebanon County, Pennsylvania.

Newmanstown is in southeastern Lebanon County along the northeastern edge of Millcreek Township.

Route 419 runs through the center of town as Main Street, leading northeast 2 miles (3 km) to Womelsdorf and southwest 6 miles (10 km) to Schaefferstown.

According to the United States Census Bureau, the Newmanstown CDP has a total area of 2.2 square miles (5.7 km2), all land.

25.2% of all households were made up of individuals, and 12.6% had someone living alone who was 65 years of age or older.