A discontinued post office or DPO is an American postal term for a post office which is no longer in service or is in service under another name.[1][2] Some are in ghost towns, some victims of consolidation of mail service as small post offices are closed or a city expands. The introduction of Rural Free Delivery, RFD, in 1902 led to the closure of many post offices, which peaked in 1901 at 76,945. In the United States, which was mostly rural, mail previously had been picked up in rural areas at small local post offices, home delivery being limited to urban areas until experimentation with rural delivery began in 1890.[3]
Covers, that is letters, wrappers, or postmarks from discontinued post offices are of interest to students of postal history.[4] As one example, in Saguache County, Colorado there are over 50 discontinued post offices.[5][6]
The increase in the number of rural delivery routes led to a decrease in the number of small Post Offices. In 1901, the Post Office Department operated the largest number of Post Offices in American history, 76,945. The next year, there were 1,000 fewer Post Offices. Despite a growing population and more mail, the number of Post Offices continued to drop each subsequent year, with the exception of 1947 and 2001.