Is northwestern mutual life insurance good? Northwestern Mutual is an excellent option for life insurance. It scores a 4.6 and is the No. 1 overall Best Life Insurance Company in our rating. Northwestern Mutual scores highly thanks to its numerous options and coverage types, giving consumers flexibility to research and select the best plan for them.What is northwestern phone number? The customer support phone number of Northwestern Mutual is +1-414-271-1444 (Click phone number to call).What is northwestern mutual life insurance? The Northwestern Mutual Life Company has been a provider of life insurance since 1857 and, according to its corporate website, now as 4.4 million clients. The company has been consistently highly rated by major financial strength rating organizations. Northwestern Mutual provides other products and services besides life insurance.