Someone who kills by accident has to go live in one of the Arei Miklat. The Rambam paskens this halacha and does not specify that it only applies at a particular time, only when there's a Sanhedrin, or only when there's a goel hadam actually trying to kill the murderer.
Is there any reason it wouldn't apply nowadays? I understand that for many years it would have been impossible for most people to travel to Israel, and maybe the assumption was that even if they tried to get there they would fail. Nowadays, Chevron is not the easiest or safest place to live, but it's definitely possible to live there and people do.
Of the other major cities, Golan is just over the Syrian border and was recently retaken from ISIS by the Syrian government, Shechem is fully under the PA and has no Jews, Ramos is in Jordan, Betzer is also in Jordan and its exact location is unknown, and Kedesh is a ruin, so Chevron is probably the safest (!) choice. I didn't look into the other 42.
The requirement to stay in these cities overrides even pikuach nefesh and the needs of the entire Jewish people, so this question is independent of whether it's politically advisable to maintain a Jewish community in Chevron.
Does an accidental murderer have to go live in Chevron? And are there any accidental murderers currently living in Chevron or one of the other cities for this reason?