Although Massachusetts officials are sharply curtailing the supply of coronavirus vaccine to most cities and towns, they are also encouraging municipal governments to band together and create high-capacity regional sites that can deliver more vaccinations than any single community.

On Wednesday, the administration of Governor Charlie Baker approved 11 “regional collaboratives” that would not be quite as massive as the seven state-run mass clinics at locations as cavernous as Gillette Stadium and Fenway Park, but much larger than the smaller clinics so far operated by local governments.