is twice the size of Manhattan. The town is bordered to the West by Port Chester, New York, Rye Brook, New York, and White Plains, New York. To the North it is bordered by Armonk, New York, and Banksville, New York. To the South it is bordered by the Long Island Sound. To the East, it is bordered by Stamford, Connecticut. Neighborhoods and sections The U.S. Census Bureau recognizes nine CDPs within the town: Byram, Cos Cob, Glenville, Indian Field, Old Greenwich, Pemberwick, Riverside, Rock Ridge and the Greenwich CDP covering the historic municipal center of the town. The USPS lists separate zip codes for "Greenwich" (spanning two zip codes), Cos Cob, Old Greenwich, and Riverside, for a total of five zip codes, plus a sixth zip code for PO Box. Additionally, Greenwich is often further divided into several smaller, unofficial neighborhoods. The Hispanic and Latin American population is concentrated in the southwestern corner of the town. In 2011, numerous neighborhoods were voted by the Business Insider as being the richest neighborhoods in America. Back Country Banksville (Connecticut side) Belle Haven Bruce Park Byram Chickahominy Cos Cob Edgewood Fourth Ward (Fourth Ward Historic District) Glenville Downtown/Central Greenwich Greenwich Cove Holly Hill Mianus Mid-Country Milbank Milbrook Municipal Center District North Mianus North Street (refers to the neighborhood surrounding North Street) Old Greenwich (Sound Beach) Palmer Hill Pemberwick Pine Hill Riverbank Riverside Riversville Rock Ridge Round Hill Stanwich Historical sites Bush-Holley House Putnam Cottage Thomas Lyon House Islands Calf Island is a island about from the Byram shore in Greenwich. More than half of the island (on the west side) is a bird sanctuary off-limits to members of the public without permission to visit. As of 2006 the island is available for overnight stays for those with permits, otherwise the east side is open from dawn until dusk. Great Captain Island is also off the coast of Greenwich, and includes the southernmost point in Connecticut. There is a U.S. Coast Guard lighthouse on this island, as well as a designated area as a bird sanctuary. The lighthouse is a skeletal tower. Island Beach or "Little Captain Island" once was the venue for the town's annual Island Beach Day. Ventriloquist Paul Winchell and his dummy, Jerry Mahoney, once came for a show, and on another occasion the Connecticut National Guard let adults and children fire machine guns into the water, according to an