Compo is a census-designated place (CDP) in the town of Westport, Fairfield County, Connecticut, United States. It is in the south-central part of the town, lying between the Saugatuck River and the neighborhood of Saugatuck to the west, and Compo Cove, Sherwood Millpond, and the neighborhood of Greens Farms to the east. The CDP extends south to Compo Beach on Long Island Sound and north to U.S. Route 1 (Post Road). Interstate 95 crosses the middle of the CDP from east to west, with access from either Saugatuck or Greens Farms.