Richlandtown is a borough in Bucks County, Pennsylvania, United States. The population was 1,327 at the 2010 census.
Richlandtown is located at 40°28′23″N 75°19′17″W (40.473184, -75.321523). It is completely surrounded by Richland Township.
According to the United States Census Bureau, the borough has a total area of 0.2 square miles (0.52 km2), all of it land.
As of the census of 2000, there were 1,283 people, 430 households, and 319 families residing in the borough. The population density was 5,034.2 people per square mile (1,981.5/km²). There were 451 housing units at an average density of 1,769.6 per square mile (696.5/km²). The racial makeup of the borough was 98.29% White, 0.39% African American, 0.47% Asian, 0.39% from other races, and 0.47% from two or more races. Hispanic or Latino of any race were 1.25% of the population.