John Gill Commentary Joshua 21:26

"All the cities of the families of the rest of the children of Kohath were ten with their suburbs." — Joshua 21:26 (ASV)

All the cities [were] ten, with their suburbs Four out of Ephraim, four out of Dan, and two out of the half tribe of Manasseh: which were for the families of the children of Kohath that remained : who were of the other branch of the Kohathites, and who did not descend from Aaron, and were only Levites, and not priests; (See Gill on Joshua 21:20).