|Demographics||57% derro, 39% morlock, 3% human, 1% other|
Source: Into the Darklands, pg(s). 28-29
Because of their insanely chaotic nature, derro generally do not congregate in large numbers or have much to do with the other races of the Darklands. The one exception to this is the town of Krba, located in the realm of Nar-Voth not far from the drow city of Delvingulf.
Although the majority of the town's population is derro, Krba also contains a large minority of allied morlocks. In what is even more unusual for members of their race, the inhabitants of Krba maintain trading relationships with other denizens of the Darklands, including the drow of Sekamina, and even the Chelish capital city of Egorian. A few of the decadent noble families of that city have contacts with the derro and use them to disappear unwanted individuals from time to time.