countable noun. 1  A peninsula is a long narrow piece of land which sticks out from a larger piece of land and is almost completely surrounded by water. 2  a narrow strip of land projecting into a sea or lake from the mainland. 3  a land area almost entirely surrounded by water and connected with the mainland by an isthmus.
Northwestern Mutual Customer Service Phone Number Phone Number of Northwestern Mutual is +1-414-271-1444. Northwestern Mutual is one of the leading insurance company situated in the United States.
We'll be ready to help you right away based on the information you've already provided. If you prefer to call the general help line instead, please note you will need to answer a series of questions to verify your identity. Toll free: 1 (866) 216-1072. International: 1 (206) 266-2992 --- charges may apply.