Two competing dates generally have been cited for Benjamin Banneker’s death: October 9, 1806, and October 25, 1806. Both dates appear in multiple reputable publications. The October 9 date has its origin in the obituary for Banneker that appeared in the Federal Gazette and Baltimore Daily Advertiser on October 28, 1806. It began, “On Sunday, this 9th instant, departed this life at his residence in Baltimore county, in the 73rd year of his age, Mr. BENJAMIN BANNEKER, a black man, and immediate descendant of an African father…"
The publications and institutions that have taken the obituary at face value and cited October 9 as Banneker’s death date likely were either unaware of or chose to overlook the fact that October 9, 1806, was a Thursday and not a Sunday as stated in the obituary. The absence of a confirming primary source or explanation makes the October 25 date unconvincing and perplexing.
A third date, October 19, 1806, is cited in Oxford University’s American National Biography. After consulting Maryland Historical Society reference librarian Francis P. O’Neill, Britannica chose to identify this date, October 19, as the most likely, though not definitive, date of Banneker’s death. Having identified the Federal Gazette and Baltimore Daily Advertiser obituary—which is displayed at Benjamin Banneker Historical Park and Museum—as the indispensable primary source, O’Neill asked the crucial question: Did the newspaper provide the wrong day of the week for the date or the wrong date for the day of the week? He concluded that the latter was most likely the case, probably as a result of the newspaper’s compositor errantly setting a “9” rather than a “1” and a “9.” October 19, 1806, was indeed a Sunday. It would have been much easier for the compositor to commit an error of omission, leaving out one element of type (the “1”), than to have erred through commission and mistakenly typeset “Sunday” rather than “Thursday.” Newspapers in the United States in the 19th century abounded in human error, and a slip from the “19th” to the “9th” is not implausible.
Moreover, O’Neill reasoned that an October 9 death date implied that it would have taken nearly three weeks for news of Banneker’s death to have travelled the roughly 15 miles (24 km) that separate Ellicott City (where Banneker died) from Baltimore (where the Federal Gazette was published). A week to 10-day interval between death and type-setting for the October 28 publication of the newspaper seems much more likely. This interpretation is supported by the fact that the news for the obituary that followed Banneker’s in the newspaper—the death of a resident of Cecil County who died on October 20—would have covered more than twice the distance of the report of Banneker’s death to reach the office of the Federal Gazette and Baltimore Daily Advertiser at about the same time the news of Banneker’s demise probably arrived.
