Mount Pleasant Mills is a census-designated place in Snyder County, Pennsylvania, United States. The population was 342 at the 2000 census.Mount Pleasant Mills is located at 40°43′25″N 77°1′2″W / 40.72361°N 77.01722°W / 40.72361; -77.01722.According to the United States Census Bureau, the CDP has a total area of 1.5 square miles, all of it land.As of the census of 2000, there were 342 people, 141 households, and 93 families residing in the CDP. The population density was 225.9 people per square mile. There were 152 housing units at an average density of 100.4/sq mi. The racial makeup of the CDP was 99.71% White, and 0.29% from two or more races.There were 141 households out of which 29.8% had children under the age of 18 living with them, 58.2% were married couples living together, 3.5% had a female householder with no husband present, and 34.0% were non-families. 29.8% of all households were made up of individuals and 14.9% had someone living alone who was 65 years of age or older.