Smicksburg is a borough in Indiana County, Pennsylvania, United States. The population was 46 at the 2010 census, and is one of the smallest incorporated boroughs in Pennsylvania. It was founded by the Reverend J. George Schmick.
Smicksburg is located at 40°52′7″N 79°10′13″W (40.868715, -79.170415).
According to the United States Census Bureau, the borough has a total area of 0.1 square miles (0.26 km2), all of it land.
As of the census of 2000, there were 49 people, 25 households, and 14 families residing in the borough. The population density was 362.5 people per square mile (135.1/km²). There were 28 housing units at an average density of 207.1 per square mile (77.2/km²). The racial makeup of the borough was 100% White.
There were 25 households, out of which 16% had children under the age of 18 living with them, 40% were married couples living together, 8% had a female householder with no husband present, and 44% were non-families. 40% of all households were made up of individuals, and 24% had someone living alone who was 65 years of age or older.