I found this online:
The Baltimore Oriole birds diet consist of insects, fruits, and flower nectar. You can attract this bird to your backyard by setting out orange halves or grape jelly on a Fruit Feeder in early spring, or by using a sugar water mixture. 1 part sugar to 4 parts water. Boil sugar water mixture and let cool.
The prefered habitat of Orioles is in open woodlands of deciduous trees near parks, gardens, and in suburban settings.
I have only seen a couple of orioles twice, in the 17 years we've been in this house, and those were fleeting moments, but they were beautiful.
This link has a map that shows when they might appear in your area.
baltimore orioles Good luck trying to attract them!