Which of these positions typically focuses on delivering customer service at the counter?

The position that primarily focuses on delivering customer service at the counter is the Lobby Assistant. This role is often centered around direct interaction with customers, providing assistance with various services such as package pick-up, mailing options, and answering inquiries. Lobby Assistants are typically stationed in the public area of a post office, ensuring that customers receive immediate help and support for their postal needs.

In contrast, while other roles like Postal Clerks also interact with customers, they may not be as intensely focused on frontline service as the Lobby Assistant. Postal Clerks often handle transactions and may work behind the counter, which can involve a mix of customer service and operational tasks rather than solely focusing on in-person assistance.

The Manager and Supervisor roles are more focused on overseeing operations, ensuring policies are followed, and managing staff, rather than directly providing customer service at the counter. They play essential roles in the functioning of a post office but do not typically interact with customers as their primary duty. This highlights why the Lobby Assistant is the most appropriate answer for a role concentrated on delivering customer service directly at the counter.