Who is the miller insurance agency? WHAT WE OFFER! The Miller Insurance Agency is a local Northwest independent insurance agency offering personal insurance and business insurance.How do i contact millers mutual insurance company? Phone: Call Millers Mutual at 1-800-745-4555 (select #2 for Claims at the voice prompt). Please have your policy number available when you call.How can i contact miller for sales inquiries? Please provide as much detail as possible; we will respond to the best of our ability with the information given. For inquiries outside the US or Canada, contact a representative in Miller's global network of commercial offices, warehousing facilities, and inpidual sales.How do i contact miller outside of the us or canada? For inquiries outside the US or Canada, contact a representative in Miller's global network of commercial offices, warehousing facilities, and inpidual sales. Information about your country's office can be found in the International area of Where To Buy .