Map for International Center for Advocacy Map for International Center for Advocacy Search | Advanced Search | New Members | Coupons and Discounts | All Categories Advertising & Media >> Non-Profit Organizations International Center for Advocacy P.O. Box 6 Westerville, OH 43081 | directions (614) 615-7971 Need to update your categories or expand your listing? Or want to learn how your business can become a part of the Chamber? Contact us at membership@columbus.org for assistance.