The population was 937 at the 2010 census.
Bowmanstown is located in southern Carbon County at 40°48′3″N 75°39′44″W (40.800737, -75.662167), on the northeast bank of the Lehigh River. It is bordered on the east and north by Lower Towamensing Township, on the southeast by the borough of Palmerton, and on the southwest and west by East Penn Township.
According to the United States Census Bureau, the borough has a total area of 0.80 square miles (2.07 km2), of which 0.77 square miles (1.99 km2) is land and 0.03 square miles (0.07 km2), or 3.59%, is water.
As of the census of 2000, there were 895 people, 389 households, and 257 families residing in the borough. The population density was 1,156.2 people per square mile (448.8/km²). There were 417 housing units at an average density of 538.7 per square mile (209.1/km²). The racial makeup of the borough was 99.44% White, 0.22% Asian, and 0.34% from two or more races. Hispanic or Latino of any race were 0.89% of the population.
There were 389 households, out of which 27.0% had children under the age of 18 living with them, 54.0% were married couples living together, 8.0% had a female householder with no husband present, and 33.9% were non-families. 28.5% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.77.
In the borough the population was spread out, with 20.0% under the age of 18, 7.4% from 18 to 24, 29.6% from 25 to 44, 26.0% from 45 to 64, and 17.0% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 92.5 males. For every 100 females age 18 and over, there were 90.4 males.
The median income for a household in the borough was $34,688, and the median income for a family was $39,018. Males had a median income of $31,845 versus $20,913 for females. The per capita income for the borough was $16,956. About 7.4% of families and 9.2% of the population were below the poverty line, including 10.5% of those under age 18 and 12.3% of those age 65 or over.