How do I address envelope to the Earl and countess?

To address an envelope to an Earl and Countess, you should write their titles in the following format: "The Earl and Countess of [Title/Place]." For example, if their title is Earl of Oxford, you would write, "The Earl and Countess of Oxford." Ensure the names follow the titles on the next line, formatted as "The [First Name] [Last Name]" for the Earl and "The [First Name] [Last Name]" for the Countess.