There is no official list of constellations specifically for the Northern Hemisphere. The 88 constellations recognized by the International Astronomical Union (IAU) are spread across the entire celestial sphere.

While some constellations are more prominent in the Northern Hemisphere (like Ursa Major, Cassiopeia, Orion), others are more prominent in the Southern Hemisphere.

Therefore, it's not accurate to say how many constellations are specifically in the Northern Hemisphere. It's better to think about constellations as being visible from different locations on Earth at different times of the year.