$646,900 is the average for SFH in my area (defined as non-condo, non-townhouse). But we're right near the metro in Arlington, VA, so when you factor in the huge number of condos and THs, it's $437,300. Those are for my neighborhood.
Factoring in the entire county, its $520,700 for all homes, $654,100 for SFH only.
We got very lucky when we bought, managed to time the market right at the bottom and actually find a place in a desirable neighborhood -- listings were very thin. Our house is near the metro and cost significantly less than those medians. So no, I definitely don't have a 600k house.