That depends on which Stark County you mean.
Stark County, Illinois has had 9 tornadoes in the years 1950-2010
Stark County, North Dakota has had 19 tornadoes from 1950 to 2010.
Stark County Ohio has had 11 tornadoes from 1950 to 2010.
There were a total of 27 tornadoes that hit Stone County, Missouri between 1995 and 2010.
Yes, a few tornadoes has in fact been confirmed in Orange County. but i dont think strong tornadoes can hit LA it is highly unlikley
There were 129 tornadoes in Texas in 2009.
A total of 9 tornadoes hit California in 2011.
33 F3 tornadoes have hit Florida since 1950.
There were 37 tornadoes in Nebraska in 2010.
There were 178 tornadoes in Texas in 2004.
There were 11 tornadoes in Indiana in 2009.
There were 39 tornadoes in Florida in 2011.
There were 30 tornadoes in Florida in 2015.
There were 16 tornadoes in Wisconsin in 2009.
an average of 20 tornadoes per year