The first post office was established in 1858 in the area was west of present Delano and was named Cassel. The first postmaster was Theodore Jaegler. He was succeeded by William Ziebarth in 1865, John Tuckson in 1966, and David White in 1867. Soon after the coming of the railroad in 1868, the Cassel office was discontinued, and the Crow River office was established. Sometimes, in those early days, whenever any settlers went to St. Anthony Falls for supplies, they brought back mail addressed to (name), Minneapolis, Minnesota – Crow River. It was then left at William Wasson’s small store, which was in J. P. Lyle’s old log house. Delano’s first postmaster was Frank M. Hopkins. Appointed in December 1868, his office was in his general store across from the depot. It was found that there was a Crow River post office already in Minnesota as well as other names that were considered. Finally, a meeting was held on the depot platform, and it was decided to name the post office Delano, after Francis Roach Delano, a railroad official. In the winter of 1868-69 Frank B. Nichols built a general store and was the second postmaster, appointed in 1871.

J. M. Langford was appointed postmaster in 1872; his assistant was Miss Kerr. Again, the office was in a different location. Mrs. Miranda Chance was Delano’s first female postmaster, appointed in 1880; the office was in the Chance drug store. Her assistant was her son, Norman Chance, who was appointed postmaster in 1883. Valentine Eppel was the next postmaster; the post office was located on Main Street. Charles H. Vorse was appointed next, with the office remaining in the same building. Michael O’Hair was appointed in 1893; he moved the post office back to where Mrs. Chance had it. Frank C. Lindsley became the postmaster in 1897, moving the office into his own building on Second Street. Clarence J. Buckley, first appointed in 1903 and serving for three terms began in the Lindsley building, moved down the street, and finally used the former Wright County Bank building as the post office.

“The post office has been moved to the building recently occupied by the Wright County Bank, and it is expected that the new quarters will prove very convenient and desirable. The building is one of the best structures in town and there is ample accommodation for the R.F.D. carriers in the large room back of the main office.” (from the Delano Eagle, January 21, 1909)

Henry Bock was next appointed in 1916, serving two terms. He started out in the former back building, later moving to his own building in the brick block on Bridge Avenue. Miss Elizabeth Richardson, who worked as the assistant to both C. J. Buckley and Henry Block, was appointed postmaster in 1925. The post office was moved into the former First National Bank building on River Street August 26, 1926, (The building occupied by LuLu’s Retail Therapy In 2025.) Albert O. McEachern became postmaster in 1933, and served 31 years, retiring in 1964. Wally Grotz was appointed in 1965 and was in charge of the post office during the record-breaking flood of that year.

He was also the postmaster when the new post office was built and dedicated in 1965.

Paul E. Naegeli was appointed postmaster in 1982, followed by Howard A. Leathers in 1993, Josephine Ambroz in 1996, Darryl W. Peterson in 1999, and Dale R. Gatz in 2000. In 2005 Larry D. Matson became Delano’s postmaster. Debra R. Eriech served starting in 2012, and in 2014 Mark P. Hayes was appointed and remains Delano’s postmaster in 2026.

Postmaster Mark Hayes, 2024 with Mr. Zip

Mr. ZIP, the mascot for the U.S. Postal Service's Zone Improvement Plan (ZIP Code), was officially unveiled to the public at a convention of postmasters in October 1962. The five-digit ZIP Code system itself was introduced on July 1, 1963.