Campor III was the inhabited third planet in its star system. This was the home of a Federation colony, which was established on the planet in 2371. At some point in that year, Julian Bashir was scheduled to set up a field hospital in this colony. (DS9: "Defiant")

This planet was only mentioned in dialogue.
"KAM-poor" was the pronunciation for this planet's name from the script pronunciation guide. [1]
According to Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Campor III was listed as a Federation member. Note: The Roman numeral I was inadvertently dropped from this name, so the name reads Campor II.