Register Your Business with the Town of Trumbull: To register your business with the Town of Trumbull you will need to complete a Trade Name Certificate (PDF).Guidance for completing this form can be found here. This form will need to be reviewed and signed by the Zoning Enforcement Officer (203-452-5052) prior to filing it with the Town Clerk’s Office (203-452-5037). Registering your business with the Town helps to ensure you are aware of and in compliance with Town regulations, tax obligations, permits, etc.