Brown Brothers Harriman & Co. Visit Website 3100 West End Avenue Suite 450 Nashville, TN 37203 (615) 279-8880 About Map About Brown Brothers Harriman & Co. is the oldest and one of the largest private banks in the United States. In 1931, the merger of Brown Brothers & Co. and Harriman Brothers & Co. formed the current BBH. What's Nearby? Distance: 5 10 15 20 25 50 mi. .