The United States Postal Service in Larchmont offers fast and professional service, particularly for passport applications. Customers appreciate the quality of passport photos provided, noting they are better than those from nearby stores. The staff is described as excellent and friendly, contributing to a quiet and peaceful atmosphere. One customer shared a positive experience when the staff accommodated a mistake with a passport appointment. However, there have been concerns about communication regarding packages, with some customers experiencing delays and difficulties in reaching specific staff members. Overall, the location is recommended for its services and helpful staff.