Welcome to the Upper West Side Party Supplies section, which lists businesses providing party supplies in 10023, 10024, 10025, 10026 and 10027 zip codes. Click on any business to obtain additional information and to pinpoint its location on the map or scroll down to view party suppliers by block. Be sure to hold your mouse over businesses in bold italics for a special pop-up description. You might also be interested in our UWS Party Planners & Locations section.