The Wellesley Square Post Office is located at 1 Grove St., between Town Hall and the Wellesley Square commuter rail stop. To the left of the front of the building is the Station Oak, the town's oldest public tree. The post office runs 18 letter carrier routes and employs 26 people, including a letter carrier for each route, one supervisor and seven clerks who distribute the mail and serve customers. Andrew Williams is currently the acting supervisor for the post office.