As far as I can tell, there are no ordinances posted online. Call your county offices and ask them if they have them.
No offense, but I doubt a rural county would outlaw open carry.
Here's their website if you'd like a looksee: www.howellcounty.net
And for something more interesting look at the Howell County Sheriff, who claims you need a "permit to acquire" before purchasing a handgun: http://www.howellcountysheriff.com/CCW.htm