From Charlotte Hall to OC approx. 160 miles, depending on how many stops can be done in less then 3 hours, Route 5, to 301, to 50. Of course coming from southern end of county Route 4 to Route 2, to Route 50, you have all the stoplights and alot of single lane road on Route 2, will add alot of time to your trip. Thats a good one about are we there yet.