J. Allen Hynek Center for UFO Studies from Chicago published a map of UFO sightings in the US. It indicates the number of UFO reports per 100.000 people by county in the continental US. This choropleth map shows that there is a marked difference in levels of UFO visitation between the eastern and western US. Also the south is UFO-free. Preferred landing spots of UFOs are concentrated in the states of New Mexico, Colorado, Wyoming, Montana, with a spike around Area 51. A choropleth map uses graded differences in shading or color or the placing of symbols inside defined areas on the map in order to indicate the average values of some property or quantity in those areas.
http://strangemaps.wordpress.com/2007/11/
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