america
Boston - Claire, Frank and Bree lived in Boston (DIA, chapter 1) Frank and Claire moved to Boston before Brianna was born so Frank could take up a position at Harvard and they could start their lives afresh in a city where no-one knew them (V, chapter 3)
New York - Claire catches a plane from Scotland to New York (V, chapter 18)
Roxbury - a suburb of Boston. Claire considers that parts of Roxbury in the 20th century are as dangerous as the alleyways of Paris in the 18th century (V, chapter 19)
Truro - Brianna had a lump of pumice taken from the beach at Truro (V, chapter 19) Truro is a summer vacation community near the northern tip of Cape Cod in Massachusetts