Question: At the 2010 census, what was the population of the town in which resides the main campus of Brunswick (Brittonkill) Central School District?
Sentence (from "Keystone Central School District"): The Keystone Central School District (KCSD) is a midsized rural, public school district based in Lock Haven, Pennsylvania that includes public schools in Clinton County, and that serves students in Clinton County, Centre County, and Potter County.
Relevant evidence: No