These citypopulation.de "cities" aren't each confined to a single state. Most of their "Washington" city (including the city of Baltimore) is contained in Maryland. Shouldn't Maryland get credit for it?
Why bother cheat? No one cares but yourself. If you don't legitimately know, click "Give up" and actually learn the answers. Do you think people lust after some kind of a gold star for getting a million wrong guesses first? It's about knowledge and learning, not false, anonymous bragging to other anons that don't care.