So the two I can think of are the ISS orbit and GEO. Are there any other orbits that consistently have 10+ launches a year?
For this question, when I say matching orbit, I mean eccentricity, semimajor axis, inclination, longitude of the ascending node, and argument of periapsis. So SSOs with different longitudes of the ascending node wouldn't count.
Perturbations and drag will also take satellite orbits away from being exact, so as long as they have the same intended orbit, they should count.