The postal history of Holyoke is as complex as the city itself. As an example, in 1929, when the main post office was on 31 Main Street, there were 10 substations around the city. They were numbered 1 to 3 and 5 to 11. There were also two branch post offices – one in South Hadley and one in Willimansett. There was also a Holyoke Post Office Station at 239 Main Street (behind the Phoenix Building).