The market maps are here:
http://www.dbstalk.com/ekb/TVMarkets/Missouri Auditors Primary, 2006St. Louis: Jackson 40, Loudon 32, Thomas 17
Kansas City: Thomas 37, Jackson 21, Loudon 19
Springfield: Thomas 36, Loudon 23, Jackson 20
Columbia: Loudon 31, Jackson 28, Thomas 26
Cape Giraudeau: Jackson 35, Thomas 26, Loudon 19
Hannibal: Thomas 28, Jackson 25, Loudon 23
Kirksville: Thomas 35, Jackson 27
Joplin: Thomas 47, Jackson 23
St. Joseph: Thomas 35, Jackson 23, Loudon 19
and the other 3 markets are all 1 county.
But for places like Nevada and New Jersey, the split should be pretty easy to calculate for
