Yep, Montgomery County, MD, #15 on the first list, #16 on the second, #13 on the third list. No wonder my children will likely never be able to afford to live here (and no, they are no living with me!

).
We're in the "Up County", so not as expensive as closer to DC. However, we're in a planned community, so more expensive than the towns around us. It's really exploded in value in the last several years and there is no way that we'd be able to afford our house if we were to want to buy it today.