Kitchen counters are typically 36" because we stand and work at them. Vanities used to be 30" which makes them easier to sit on and also means that you can see yourself in a mirror down past your waist. Lately, though, people have been raising vanity heights to 36".

thank you for the info we are now in the process of our house construction and really would like to make sure that the heights of these important part of the house is correct