We got married out of County and when the license was completed by the preacher, he lied about the location of the wedding. I am wondering if the wedding is valid? How much trouble will I be in for signing a document that I knew was false?
Licenses to marry are granted statewide in Florida, so I'm not sure what your preacher's concern was. At any rate, signing a false document under oath could be a felony in Florida and could be punishable by prison. Nevertheless, as a practical matter, I doubt that anyone will really care. I doubt that the police or the state attorney's office would actually file the charges, but if you suspect that they will, you should contact a local criminal defense attorney.
If you wanted to be absolutely certain that your marriage was valid, you could file a new marriage certificate correcting the error.