 Smithton is completely surrounded by South Huntingdon Township

As of the census of 2000, there were 444 people, 188 households, and 124 families residing in the borough.The population density was 3,858.5 people per square mile (1,428.6/km²).There were 208 housing units at an average density of 1,807.6 per square mile (669.2/km²).