Marsh McLennan Agency Marsh McLennan Agency Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Services >> Finance Marsh McLennan Agency 960 Broadway Ave Ste 500 Boise, ID 83706 | map | directions Mike Zahn (208) 424-2900 | fax: (208) 424-2999 Visit Site Connect With Us Insurance, surety, and risk management programs for regional construction operations. Member Since: 2005