U.S. Embassy Libreville has confirmed that exit visas for U.S. citizens with residence permits (cartes de séjour) are no longer required.
Short-term visitors to Gabon are permitted to stay up to 90 days. Visitors who wish to remain in the country for longer than 90 days must obtain a residence permit (carte de séjour). In the past, Gabon had required exit visas for U.S. citizens with a carte de séjour. With this change, U.S. citizens with a carte de séjour can depart from Gabon without an exit visa.
The Embassy will post updates if additional information becomes available.