The United States Postal Service at 4304 18th St is a reliable and affordable option for mailing and package delivery, serving over 157 million addresses in the U.S. and worldwide. The post office is known for its manageable lines and efficient service, with staff who are friendly and often greet customers by name. Many customers appreciate the availability of self-service supplies, making it easy to handle simple mailing tasks. However, there are some concerns regarding customer service, particularly for older clients who may struggle with technology. One customer expressed frustration over a counter staff member's lack of empathy when trying to renew a PO Box, suggesting that more understanding could improve the experience for those less familiar with online processes. Overall, the post office is a good choice for mailing needs, offering convenient drop-off options for labeled packages and a selection of packing supplies, greeting cards, and gift cards. The staff is praised for their helpfulness, even assisting with packing when needed, making visits pleasant for regular customers.