Where is the northern hemisphere

I live in America; I live in the Northern Hemisphere. The earth is basically a ball; it is the top half of that ball.

Northern Hemisphere from above the North Pole.

The Northern Hemisphere of Earth is the half that is north of the equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North pole.