Question: According to the 2010 census, what was the population of the county which headquarters the DeKalb County School District?

Context articles: Western Beaver County School District
Southern York County School District
DeKalb County School District
Juniata County School District
James R. Hallford Stadium
Miller Grove High School (DeKalb County, Georgia)
Mike Thurmond
Mifflin County School District
Cameron County School District
DeKalb County, Georgia

The Western Beaver County School District is a diminutive, rural, public school district serving the boroughs of Industry, Pennsylvania, Glasgow, Pennsylvania and Ohioville, Pennsylvania.
 Western Beaver County School District encompasses approximately 34.5 sqmi .
 According to 2000 federal census data, it served a resident population of 5,743.
 By 2010, the district's population declined to 5,429 people.
 The educational attainment levels for theWestern Beaver County School District population (25 years old and over) were 92.5% high school graduates and 14.4% college graduates.
 The District is one of the 500 public school districts of Pennsylvania.
The Southern York County School District is a suburban, public school district in York County in the South Central region of Pennsylvania.
 It serves: Codorus Township, Glen Rock, Railroad, New Freedom, Shrewsbury Township, Shrewsbury, and a portion of Hopewell Township.
 Southern York County School District encompasses approximately 68 sqmi .
 According to 2000 federal census data, it served a resident population of 18,592 people.
 By 2010, the district's population increased to 20,858 people.
 The educational attainment levels for the Southern York County School District population (25 years old and over) were 89.3% high school graduates and 26.5% college graduates.
The DeKalb County School District (DCSD) is a school district headquartered at 1701 Mountain Industrial Boulevard in the City of Tucker, DeKalb County, Georgia, United States.
 DCSD operates public schools in areas of DeKalb County that are not within the city limits of Atlanta and Decatur.
The Juniata County School District is a rural, public school district located in Juniata County, Pennsylvania.
 The district is one of the 500 public school districts of Pennsylvania and one of seven county-wide school districts in the Commonwealth.
 The district encompasses approximately 372 sqmi .
 Juniata County School District serves residents in: Beale Township, Delaware Township, Fayette Township, Fermanagh Township, Lack Township, Milford Township, Monroe Township, Spruce Hill Township, Susquehanna Township, Turbett Township, Tuscarora Township and Walker Township.
 It also serves the residents of the following boroughs: Mifflin, Mifflintown, Port Royal, Thompsontown, East Salem, East Waterford, Mexico, McAlisterville and Richfield.
 According to 2000 federal census data, Juniata County School District served a resident population of 22,273 people.
 By 2013, the US Census reports that the Juniata County School District's resident population grew to 24,005 people.
 The educational attainment levels for the Juniata County School District population (25 years old and over) were 82.4% high school graduates and 11.2% college graduates.
 The district is one of the 500 public school districts of Pennsylvania.
James R. Hallford Stadium is a football stadium in Clarkston, Georgia.
 It was the home stadium of Georgia Generals of the American Soccer League and Atlanta Silverbacks of the A-League until they moved to the RE/MAX Greater Atlanta Stadium in 2004.
 The stadium holds 15,000 spectators and is currently used by two DeKalb County high schools.
 The stadium is also used by all DeKalb County high school football teams for all home state football playoff games as this is the largest stadium and the only stadium with bleachers on both sides of the field in the DeKalb County School District.
 The GHSA held football championship games here in 1970, 1972, 1973, 1993, and 1995
Miller Grove High School is a senior high school in unincorporated DeKalb County, Georgia, near Lithonia.
 It is a part of the DeKalb County School District.
Michael L. Thurmond (born 5 January 1953) is the Chief Executive Officer of DeKalb County, Georgia.
 He has distinguished himself as an attorney, author, lecturer and public servant.
 Thurmond served as the interim superintendent of the DeKalb County School District, the third largest district in the state of Georgia from 2013-2015.
 The district serves nearly 99,000 students with over 13,400 employees.
 Thurmond was the Democratic Party's nominee for United States Senate in 2010.
 Prior to becoming DeKalb's Schools Superintendent, Thurmond was an attorney at Butler Wooten Cheeley & Peak LLP, a nationally known civil trial practice that has four times set the record civil jury verdict in the State of Georgia and also obtained for its client the largest collected judgment in U.S. history.
The Mifflin County School District is a midsized, rural public school district located in the Commonwealth of Pennsylvania.
 The district boundaries coincide with the boundaries of Mifflin County, minus the southwestern municipalities of Kistler and Newton Hamilton boroughs and Wayne Township, which are part of the Mount Union Area School District.
 Mifflin County School District encompasses approximately 362.3 square miles.
 According to 2000 federal census data, it served a resident population of 46,486.
 Based on 2010 federal census data, the district's resident population grew to 46,682.
 The educational attainment levels for the Mifflin County School District population (25 years old and over) were 81.4% high school graduates and 11.1% college graduates.
The Cameron County School District is a small, rural, public school district.
 which covers the whole of Cameron County, Pennsylvania.
 CCSD encompasses approximately 401 sqmi .
 Per the 2010 US Census Bureau, Cameron County School District's population declined to 5,080 people.
 According to 2000 federal census data, it served a resident population of 5,974.
 The educational attainment levels for the Cameron County School District population (25 years old and over) were 86.2% high school graduates and 13.9% college graduates.
 The district is one of the 500 public school districts of Pennsylvania.
DeKalb County ( ) is a county in the U.S. state of Georgia.
 As of the 2010 census, the population was 691,893, making it Georgia's fourth-most populous county.
 Its county seat is Decatur.