The county of McHenry is located in Illinois and was founded in January 16th, 1836 http://www.mchenrycountyhistory.org/day-mchenry-county-history. There are 307,343 residents in McHenry who have access to courthouses in McHenry, Woodstock. In general, each county has a full set of courts, from traffic court to superior and appellate court; supreme courts are usually located in the state capital. Illinois is part of the 7th federal circuit court as well.
There are 26,992 residents in McHenry, which is 15.0 square miles and 797ft above sea level. It was settled in May 10, 1836 http://mchenrycountyliving.com/mchenry-turns-175-city-celebrates/.
There are 24,770 residents in Woodstock, which is 13.5 square miles. It was settled in 1852.