We only had two, the children of DH's coworker. Actually DH had taken candy for them to their dad that morning, so the family came by to show us their costumes before they went to hit up the grandparents. So it was sort of like trick-or-treating in reverse.
And, because we live out in the country with no close neighbors, those were the only trick-or-treaters we've ever had in the 25 years at this house.