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I don't know if there is a definitive answer. It seems to depend on the starship. The NX-01 Enterprise ended up in the Smithsonian as mentioned by in the ENT episode "These are the Voyages....". I would assume most ended up in junkyards or dismantled for scraps at the various Federation shipyards. The Enterprise visits a scrap yard, called Zakdorn Surplus Depot Z-15, in the TNG episode Unification Part I, while looking Vulcan ship that was supposed to have been decommissioned.