Las Cruces, also known as "The City of the Crosses", is the county seat of Dona Ana County, New Mexico, United States.Las Cruces is the economic and geographic center of the fertile Mesilla Valley, which is the agricultural region on the flood plain of the Rio Grande which extends from Hatch, New Mexico to the west side of El Paso, Texas. Las Cruces is also the home of New Mexico State University, New Mexico’s only land grant university. The city’s major employer is the federal government on nearby White Sands Test Facility and White Sands Missile Range. Recently the city has been home to many of the retired from across the country. The majestic Organ Mountains, ten miles (16 Square Kilometer) to the east, are dominant in the city’s landscape, along with the Dona Ana Mountains, Robledo Mountains, and Picacho Peak.