Map for Onset Bay Association, Inc. Map for Onset Bay Association, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Non - Profit Organizations >> Vistor Centers & Services Onset Bay Association, Inc. 196 Onset Avenue/ P.O. Box 799Onset, MA 02558 | View on Google Maps (508) 295-7072 | (508) 725-2657 Visit Site If your business isn't here, contact us today to get listed!