A racial enclave is a geographic area - usually a smaller portion of a larger city, a gated community or parallel society - with high racial concentration, characteristic cultural identity, and economic activity. Racial enclaves may or may not have official recognition, their own administration, laws and even finances. A racial enclave is usually represented by a phylarch, which is the racial equivalent to an ethnarch.
Major cities in Etrand - such as Grandfolk, Copperport, Steelhelm and Dracfold - originally had racial enclaves for both the Wood Elves and High Elves. Both were recognized communities within the city, and were allowed to form their own gated communities, in which they were subject to their own laws, maintained their own schools, churches, prisons and various other institutions. Both communities were represented by a phylarch - a position with official recognition -, although how was the phylarch chosen was neither widely known nor set in stone. The phylarch's responsibility was to collect the extra tax from the community that was needed to finance the various institutions the community made exclusive for its own use.
After the Demonic Invasions of Artograch, a lot of Elves left Etrand to return to their own countries (High Elves back to Froturn, Wood Elves back to Dragoc), which were inviting them back home with news of economic boom. The remaining Elves remaining in Etrand largely became integrated members of mainstream human society, rendering the racial enclaves and phylarchs obsolete.
While other post-300 non-human immigrants to major cities would still create their own racial enclaves, none of them would be united enough to have one phylarch to represent them, let alone to warrant an official position.