There are nineteen colleges and universities in Washington, D.C., that are listed under the Carnegie Classification of Institutions of Higher Education. These institutions include five research universities, four master's universities, and ten special-focus institutions. Sixteen of Washington, D.C.'s post-secondary institutions are private, of which three are for-profit. Only three of the city's post-secondary institutions listed under the Carnegie Classification of Institutions of Higher Education are public. In addition to the institutions listed under the Carnegie Classification of Institutions of Higher Education, Washington, D.C., has three additional private not-for-profit post-secondary institutions (Johns Hopkins University's Paul H. Nitze School of Advanced International Studies,