Question: What was the population as of the 2010 census of the county in which Grindstone Mountain is located?
Context: Signal Mountain is a town in Hamilton County, Tennessee, United States.  The town is a suburb of Chattanooga and is located on Walden Ridge, a land mass often mistakenly referred to as "Signal Mountain" itself.  Signal Mountain is also used as a colloquial name for part of the Walden Ridge close to the town.  The town population was 7,554 as of the 2010 census.  The population for zip code 37377 was 15,310 as of the 2010 census. Granite County is a county located in the U.S. state of Montana.  As of the 2010 census, the population was 3,079.  Its county seat is Philipsburg.  The county was founded in 1893 and named for a mountain which contains the Granite Mountain silver mine. Elko County is a county in the northeastern corner of the U.S. state of Nevada.  As of the 2010 census, the population was 48,818.  Its county seat is Elko.  The county was established on March 5, 1869, from Lander County. Mount Laguna is a small census-designated place (CDP) in San Diego County, California.  It is located at almost 6,000 feet above sea level in a forest of Jeffrey pine, east of San Diego in the Laguna Mountains on the eastern edge of the Cleveland National Forest.  The hamlet sits at the high point of a scenic drive on Sunrise Highway from Interstate 8 to Highway 79.  Mount Laguna consists of a small general store, rustic lodge and cabins, local restaurant, rural post office, and campgrounds adjacent to the Pacific Crest Trail.  The Laguna Mountain Recreation Area surrounds the village, and the visitor's center for the pine-covered area is located here.  The mountain backcountry of San Diego County is high enough to receive snowfall in winter months, and the Mount Laguna region offers locally-unique winter recreation in the form of snow play, sledding, and cross country skiing for several days after larger storms .  The population was 57 at the 2010 census. Rapid City (Lakota: "Mni Lúzahaŋ Otȟúŋwahe" ; "Swift Water City") is the second-largest city in South Dakota (after Sioux Falls) and the county seat of Pennington County.  Named after Rapid Creek, on which the city is established, it is set against the eastern slope of the Black Hills mountain range.  The population was 67,956 as of the 2010 Census.  Known as the "Gateway to the Black Hills" and the "City of Presidents", it is split by a low mountain ridge that divides the western and eastern parts of the city.  Ellsworth Air Force Base is located on the outskirts of the city.  Camp Rapid, a part of the South Dakota Army National Guard, is located in the western part of the city.  The historic "Old West" town of Deadwood is nearby.  In the neighboring Black Hills are the popular tourist attractions of Mount Rushmore, the Crazy Horse Memorial, Custer State Park, and Wind Cave National Park. Grindstone Mountain is a mountain in the Elko Hills of Elko County, in Nevada, United States.  The summit contains several radio towers. Mountain is an unincorporated census-designated place in Oconto County, Wisconsin, United States.  The community is located at the intersection of Wisconsin Highway 32 and Wisconsin Highway 64, in the town of Mountain.  It is located at latitude 45.185 and longitude -88.474 and elevation 971 feet (mean sea level).  The postal code for Mountain is 54149.  As of the 2010 census, its population is 363.  Mountain has an area of 6.699 mi2 , all of it land. Haverhill is a town in Grafton County, New Hampshire, United States.  The population was 4,697 at the 2010 census.  Haverhill includes the villages of Woodsville, Pike, and North Haverhill, the historic town center at Haverhill Corner, and the district of Mountain Lakes.  Located here are Bedell Bridge State Park, Black Mountain State Forest, Kinder Memorial Forest, and Oliverian Valley Wildlife Preserve.  It is home to the annual North Haverhill Fair, and to a branch of the New Hampshire Community Technical Colleges.  The village of North Haverhill is the county seat of Grafton County. Grindstone-Rowes Run was a census-designated place (CDP) in Fayette County, Pennsylvania, United States.  The population was 1,141 at the 2000 census.  For the 2010 census the area was split into two CDPs, Grindstone and Rowes Run.  The village of Grindstone is located in Jefferson Township, while Rowes Run is located in Redstone Township. Stone Mountain is a city in DeKalb County, Georgia, United States.  The population was 5,802 at the 2010 census.  Stone Mountain is located in the eastern part of Dekalb County and is a suburb of Atlanta.  It lies near to but does not include the geological formation Stone Mountain.
Answer: 48,818