As of 2012, NASA employs approximately 18,000 people. The company also uses contractors for certain assignments. The number of contractors NASA uses can be as high as 70,000.
1 Additional Answer
NASA currently employs 17,900 employees and is located in Washington DC. The agency's Administrator is Charles Frank Bolden, Jr. NASA has a yearly budget of US$17.6 billion for its projects. You can find more information here: www.nasa.gov