The Kuiper belt, scattered disk, and Oort cloud are three conventional divisions of this volume of space.

Their color varies from blue-grey to very red (classes BB, BR, IR and RR).

This list includes all numbered trans-Neptunian objects with a semi-major axis greater than 30.1 astronomical units (AU), Neptune's average orbital distance from the Sun.

There are more than 3,000 unnumbered trans-Neptunian objects, defined here as minor planets with a semi-major axis larger than 30.1 AU (Neptune's average orbital distance from the Sun).

A growing number of TNOs are revealed to be binary systems with a minor-planet moon orbiting its primary.