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St. Louis County is a county located in the far eastern portion of Missouri. It is bounded by the City of St. Louis and the Mississippi River to the east, the Missouri River to the north, and the Meramec River to the south. As of the 2016 Census Bureau population estimate, the population was 998,581, making it the most populous county in Missouri. Its county seat is Clayton. As of 2009, the largest employment sectors in St. Louis County are education and health (25.2%), trade and transportation (19.6%), and professional business services (12.7%). The county also has the highest per capita income in Missouri ($49,727), and nearly one-fourth of the state workforce is employed in St. Louis County. It is home to the eighth-strongest market for technology hiring, and the world's largest concentration of plant science Ph.D.'s. Unemployment in St. Louis County is well below the national rate of 7.7% (November 2012) at 6.5% (October). One-third of the county population lives in unincorporated areas, for which the county government provides services such as zoning, code enforcement, refuse disposal, and police protection. In addition to the county-level government, there are 90 municipal governments in St. Louis County that also provide services. These vary widely in population and area. Public and non-profit private colleges and universities in St. Louis County include Concordia Seminary, Eden Theological Seminary, Kenrick–Glennon Seminary, Logan College of Chiropractic, Maryville University, Missouri Baptist University, University of Missouri-St. Louis, St. Louis Christian College, three campuses of the St. Louis Community College, Washington University in St. Louis, and Webster University..