The Delaware Department of Insurance directs companies listed on Working Form T-5 to use electronic GIS tracking software to allocate and report premiums on Delaware risks in the City of Wilmington, Wilmington, Kent County and New Castle County outside of Sussex County and states that this method will remain in effect until otherwise directed. The Bulletin cautions that reliance solely on ZIP codes may result in misclassification, noting that, effective January 1, 2025, the “city of Wilmington” is defined as ZIP Codes 19801, 19802, 19805, and 19806 and that the Commissioner expects Working Form T-5 to show higher premiums where appropriate for New Castle County outside of Wilmington.
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