Ogres are one of the smaller varieties of Géant. In Eberron, they are known to reside on multiple continents. 

Like Humains, ogres originated on the continent of Sarlona, in the region known as Borunan. Today, the ogres there are born and raised to serve their Inspiré rulers, much like the local Humains. 

Presumably, ogre slaves were brought to Khorvaire with the Humain migrations, eventually escaping. In 998 AR, Khorvairan ogres live mostly in the Southwestern portion of the continent: Breland, Drooam, and nearby nations. 

Ogre = Laborers in Sharn & Riedra, heavy infantry in Droaam. 

Ogre-Mage/Oni = Powerful, with innate magical abilities, they are either on the run from Riedran authorities or are among their most dangelrous servants. 

Eneko = True-breeding cross of Half-Géants and Ogres or Ogre-Magi; they live mostly in Syrkarn.