Ann Arbor is a city in the U.S. state of Michigan and the county seat of Washtenaw County.
Ann Arbor is home to the University of Michigan. The university significantly shapes Ann Arbor's economy as it employs about 30,000 workers, including about 12,000 in the medical centre. The city's economy is also centred on high technology, with several companies drawn to the area by the university's research and development infrastructure. High tech, health services and biotechnology are other major components of the city's economy; numerous medical offices, laboratories, and associated companies are located in the city. Automobile manufacturers, such as General Motors and Visteon, also employ residents.
High tech companies include Arbor Networks (provider of Internet traffic engineering and security systems), Arbortext (provider of XML-based publishing software), JSTOR (the digital scholarly journal archive), MediaSpan (provider of software and online services for the media industries), Truven Health Analytics, and ProQuest, which includes UMI.
Websites and online media companies in or near the city include All Media Guide, the Weather Underground, and Zattoo. Ann Arbor is the home to Internet2 and the Merit Network, a not-for-profit research and education computer network.
The city is the home of North Campus Research Complex and other research and engineering centres, including those of Lotus Engineering, General Dynamics and the National Oceanic and Atmospheric Administration (NOAA), the United States Environmental Protection Agency's National Vehicle and Fuel Emissions Laboratory and the Toyota Technical Center. The city is also home to National Sanitation Foundation International (NSF International), the non-profit non-governmental organisation that develops generally accepted standards for a variety of public health related industries and subject areas.
Ann Arbor has a population of over 121,000 people. Ann Arbor also forms part of the wider Detroit-Ann Arbor-Flint metropolitan area which has a population of over 5,320,000 people.