Question: Roy Lechthaler attended high school in a Pennsylvania town with what population as of the 2010 census?

Context paragraphs:
West Branch Area School District: West Branch Area School District is a small, rural, public school district located in Morrisdale, Clearfield County, Pennsylvania.  The district is one of the 500 public school districts of Pennsylvania.  West Branch Area School District was created in 1958 by the joining of Cooper Township High School and Morris Township High School.  The district also includes Karthaus Township and Graham Township.  The district extends across the Clearfield County's eastern border to include West Keating Township in Clinton County.  West Branch Area School District encompasses approximately 165 sqmi .  According to 2000 federal census data, it served a resident population of 7,833.  By 2010, the district's population was 7,857 people.  The educational attainment levels for the School District population (25 years old and over) were 85% high school graduates and 9.3% college graduates.  In 2009, West Branch Area School District residents’ per capita income was $15,055, while the median family income was $37,054 a year.  In the Commonwealth, the median family income was $49,501 and the United States median family income was $49,445, in 2010.

Langhorne Slim: Langhorne Slim is an American singer-songwriter, (born Sean Scolnick on August 20, 1981 in Langhorne, Pennsylvania).  Scolnick attended high school at Solebury School in New Hope, Pennsylvania, and graduated from the Conservatory of Music at Purchase College, part of the SUNY system.

Clarence Beck: Clarence Robert Beck (March 13, 1896 – August 20, 1962) was a professional football player from Harrisburg, Pennsylvania.  Beck attended high school at Harrisburg Tech where he scored a 105-yard touchdown for Tech against their rival Steelton.  After high school, Beck attended Pennsylvania State University where he became a star offensive tackle.  Beck made his professional debut in the National Football League in 1925 with the Pottsville Maroons.  He played in the NFL for one season.  Prior to that, he played for the independent Union Quakers of Philadelphia in 1921.

Wilkinsburg High School: Wilkinsburg High School (formerly Wilkinsburg Jr.  Sr.  High School) is a public school in the Wilkinsburg borough of Allegheny County, Pennsylvania, US.  It is part of the Wilkinsburg School District.  The school is the sole high school operated by the district in the Pittsburgh suburb of Wilkinsburg, Pennsylvania.  The district encompasses approximately 3 sqmi .  According to 2000 federal census data, it served a resident population of 19,196.  By 2010, the district's population declined to 15,933 people.  The educational attainment levels for the Wilkinsburg Borough School District population (25 years old and over) were 90% high school graduates and 28.5% college graduates.  The district has a mandated school uniform policy which stipulates both colors and styles of clothes.

Roy Lechthaler: Melvin Roy Lechthaler (April 1, 1908 – December 16, 1980) was an American football guard who played one season with the Philadelphia Eagles of the National Football League.  He played college football at Lebanon Valley College and attended Mercersburg Academy in Mercersburg, Pennsylvania.

Doug Buffone: Douglas John Buffone (June 27, 1944 – April 20, 2015) was an American football linebacker in the National Football League.  Buffone, the son of a coal miner (whose parents were Italian immigrants from the southern province of Cosenza, regione di Calabria), attended high school at Shannock Valley High School in Rural Valley, Pennsylvania.

Smithfield High School (Rhode Island): Smithfield High School is a high school in the Apple Valley section of Smithfield, Rhode Island near Greenville, Rhode Island, USA (in Providence County).  The high school opened in 1966, and prior to that date Smithfield students generally attended high schools in Providence or North Providence.  Smithfield High School is the only public high school in the Town of Smithfield.  High School graduations typically take place at nearby Bryant University.

Springfield School District (Delaware County): Springfield School District is a midsized, suburban, (K-12th) public school district located in Springfield Township, Delaware County.  It also serves the neighboring Morton Borough in Pennsylvania.  The district is one of the 500 public school districts of Pennsylvania.  Springfield School District encompasses just 7 sqmi .  According to 2000 federal census data, it served a resident population of 26,392.  By 2010, the district's population increased to 27,515 people.  The educational attainment levels for the Springfield School District population (25 years old and over) were 95.1% high school graduates and 38.6% college graduates.  In the 2010 census, the median household income was $87,878 compared to $52,267 in Pennsylvania.  The percent of families in poverty was 3.0; the percent of all people in poverty was 3.9; the percent of people under 18 years in poverty was 6.0.

Mercersburg, Pennsylvania: Mercersburg is a borough in Franklin County, Pennsylvania, United States.  It is 72 mi southwest of Harrisburg, the state capital.  Originally called "Black Town", it was incorporated in 1831.  In 1900, 956 people lived here, and in 1910, 1,410 people lived here.  The population was 1,561 at the 2010 census.

Brian Kelly (lacrosse): Brian Kelly (born December 27, 1980 in West Chester, Pennsylvania) is a professional lacrosse player.  He has previously played for the San Francisco Dragons and the Los Angeles Riptide of Major League Lacrosse (MLL).  He played college lacrosse for the Whittier College Poets in Los Angeles.  Kelly attended high school at Downingtown High School in Downingtown, Pennsylvania, graduating in 1999.

Supporting paragraphs: Roy Lechthaler Mercersburg, Pennsylvania
Answer: 1,561