In 1926 the post office began city delivery service from a location at 119 West Broadway. Prior to the beginning of delivery service, citizens picked up their mail from boxes at various post office locations throughout the city. The first office was located in a small store on Hawthorne Boulevard near Raymond Avenue, which is now 120th Street. This office was established on October 25, 1908 with Hallie C. Tansey serving as the first postmaster until 1909 when Martin B. Garton was named postmaster. Garton was succeeded by his brother, William, who served until 1915 and again from 1916 to 1927. Successive postmasters were James A. Rankin, Charles E. Van Der Oef, Arthur F. White, and Walter E. Neilson. Neilson retired in 1969 after 34 years of postal service. In 1937 because of flooded streets, the post office with 10 employees, was moved during the winter season to the Nelson Building on Acacia Avenue. From there it was moved to 266 North Hawthorne Boulevard. In 1942 quarters were leased in the Forrest Building until 1956 when another location was established at 12209 South Hawthorne Way. In 1970 a new post office was dedicated at 12700 South Inglewood Avenue with workable floor space of 40,000 square feet, a land area of 136,000 square feet and 160 employees serving 55 city delivery routes and five parcel post routes, requiring 20 vehicles.

Aerial view of Hawthorne, probably about 1925, taken in a plane flying just north of the present site of Hawthorne High School. Looking east across Hawthorne Boulevard, several buildings still standing are visible. Just below the Plaza at Hawthorne Boulevard and Broadway, the Reynolds Building is slightly to the left and the Mastin building slightly to the right. Trees along Prairie and El Segundo can be seen at the top of the picture and the open space of land bounded by those trees appears to be an excellent site for the location of Northrop Aircraft Company and the airport which came a decade or more later.

The first hospital care was in a residence on the south side of Broadway just a few doors west of Hawthorne Boulevard. It was operated by a Mrs. Dinsmore. In 1926 with the help of one of Hawthorne's early physicians, Dr. Leo Fate, Mrs. Dinsmore purchased property on the present site of Hawthorne Community Hospital and built a hospital complete with ten rooms for patients, a room for surgery and an office for the admission of patients. Although carpenters, plumbers and other craftsmen were employed, Mrs. Dinsmore literally helped build the hospital by doing carpentry work, painting and installing linoleum on the floors.