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Mills Case on venue

I have two cases that are basically the same facts regarding a minor that who had sex with an adult and the client is being charged with Sex Abuse and other charges. The question I have is that there are 2 counties prosecuting this case. Clackamas and Washington County. All of the activity happened in Clackamas County except for one day that the victim alleges sex occurred in Washington County. Can I use the Mills argument about venue in the reverse in that if the State doesn't have to prove venue then how can they charge the same crimes in separate counties. If it doesn't matter what county the acts occurred in it would be double jeopardy to prosecute in both counties. Any thoughts would help. Thanks!