Address Line 1 in Ethiopia is the first line of the address where you indicate the primary address information such as your civic number and street name. The Ethiopian postal code system is based on four digits, with the first digit indicating your region and the second digit indicating your central office. However, it is worth noting that Ethiopia does not have a well-established postal system, and many people do not use postal addresses. Therefore, it is important to confirm the specific requirements for address formatting with the recipient or organization you are sending mail to.