According to accounts that began to appear during the 1960s or earlier, a substantial mythology has exaggerated the accomplishments of Benjamin Banneker (1731–1806), an African-American naturalist, mathematician, astronomer and almanac author who also worked as a surveyor and farmer.

Well-known speakers, writers, artists and others have created, repeated and embellished a large number of questionable reports during the two centuries that have elapsed since Banneker lived.Multiple sources:

Bedini, 1969, p. 7. "The name of Benjamin Banneker, the Afro-American self-taught mathematician and almanac-maker, occurs again and again in the several published accounts of the survey of Washington City [D.C.] begun in 1791, but with conflicting reports of the role which he played. Writers have implied a wide range of involvement, from the keeper of horses or supervisor of the woodcutters, to the full responsibility of not only the survey of the ten-mile square but the design of the city as well. None of these accounts has described the contribution which Banneker actually made." Bedini, 1972, p. 126. "Benjamin Banneker's name does not appear on any of the contemporary documents or records relating to the selection, planning, and survey of the City of Washington. An exhaustive search of the files under Public Buildings and Grounds in the U.S. National Archives and of the several collections in the Library of Congress have proved fruitless. A careful perusal of all known surviving correspondence and papers of Andrew Ellicott and of Pierre Charles L'Enfant has likewise failed to reveal mention of Banneker. This conclusively dispels the legend that after L'Enfant's dismissal and his refusal to make available his plan of the city, Ellicott was able to reconstruct it in detail from Banneker's recollection. Equally untrue are legends that Thomas Jefferson as Secretary of State invited Banneker to luncheon at the White House. Jefferson during this period was in Philadelphia, the national capital had not yet been built, and there was no White House." Bedini, 1972, p. 186. "Another important item in the 1793 almanac was "A Plan Of a Peace-Office for the United States," which aroused a good deal of comment at the time. It was believed by many to have been Banneker's own work. Even within recent decades its authorship has been debated. In 1947 it was identified without question as the work of Dr. Benjamin Rush, in a volume of his writings that appeared in that year." Bedini, 1972, p. 403, Item 85 "William Loren Katz. Eyewitness, the Negro in American History. New York. Putnam Publishing Corp., 1967 pp. 19–31, 61–62.Brief account of Banneker's career and contributions, which are stated to have been in "the fields of science, mathematics, and political affairs," illustrated with the fictional portrait from Allen's work (item 56) and the cover page of the almanac for 1793. Among the misstatements are the claims that Banneker produced the first clock made entirely with American parts, that Jefferson promised Banneker that he would end slavery, that George Ellicott worked with Banneker in the survey of Washington, that Banneker was appointed to the Commission at a suggestion made by Jefferson to Washington, and that Banneker selected the sites of the principal buildings. The fiction that Banneker re-created L'Enfant's plan from memory is again presented, and his almanacs are said to have been published for a period of ten years."

Bedini, 1999, p. 43. "Banneker's clock was by no means the first timepiece in tidewater Maryland, as occasionally has erroneously been claimed. Timepieces were well known and available from the very earliest English settlements, ..." Bedini, 1999, pp. 132–136. "An exhaustive search of government repositories, including the Public Buildings and Grounds files in the National Archives, and various collections in the Library of Congress, failed to turn up Banneker's name on any of the contemporary documents or records related to the selection, planning and survey of the City of Washington. Nor was he mentioned in any of the surviving correspondence and papers of Andrew Ellicott and of Pierre Charles L'Enfant. ... Although the exact date of Banneker's departure from the survey is not specified in Ellicott's report of expenditures, it occurred sometime late in the month of April 1791, following the arrival of one of Ellicott's brothers. It was not until some ten months after Banneker's departure from the scene that L'Enfant was dismissed, by means of a letter from Jefferson dated February 27, 1792. This conclusively dispels any basis for the legend that after L'Enfant's dismissal and his refusal to make available his plan of the city, Banneker recollected the plan in detail from which Ellicott was able to reconstruct it. Equally untrue and in fact impossible is the legend that Thomas Jefferson as secretary of state invited Banneker to luncheon at the White House. Jefferson during this period was in Philadelphia, the national capital in Washington had yet not been built, and there was no White House." Toscano, 2000. "Some writers, in an effort to build up their hero, claim that Banneker was the designer of Washington. Other writers have asserted that Banneker's role in the survey is a myth without documentation. Neither group is correct. Bedini does a professional job of sorting out the truth from the falsehoods."

Cerami, 2002, p. 142. "He (Banneker) has existed in dim memory mainly on mangled ideas about his work, and even utter falsehoods that are unwise attempts to glorify a man who needs no such embellishments."

Fasanelli, Florence D, "Benjamin Banneker's Life and Mathematics: Web of Truth? Legends as Facts; Man vs. Legend", a talk given on January 8, 2004, at the MAA/AMS meeting in Phoenix, AZ. Cited in

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Several urban legends describe Banneker's alleged activities in the Washington, D.C., area around the time that he assisted Andrew Ellicott in the federal district boundary survey.Multiple sources: Bedini, 1969, p. 7. "The name of Benjamin Banneker, the Afro-American self-taught mathematician and almanac-maker, occurs again and again in the several published accounts of the survey of Washington City [D.C.] begun in 1791, but with conflicting reports of the role which he played. Writers have implied a wide range of involvement, from the keeper of horses or supervisor of the woodcutters, to the full responsibility of not only the survey of the ten-mile square but the design of the city as well. None of these accounts has described the contribution which Banneker actually made." Bedini, 1972, p. 126. "Benjamin Banneker's name does not appear on any of the contemporary documents or records relating to the selection, planning, and survey of the City of Washington. An exhaustive search of the files under Public Buildings and Grounds in the U.S. National Archives and of the several collections in the Library of Congress have proved fruitless. A careful perusal of all known surviving correspondence and papers of Andrew Ellicott and of Pierre Charles L'Enfant has likewise failed to reveal mention of Banneker. This conclusively dispels the legend that after L'Enfant's dismissal and his refusal to make available his plan of the city, Ellicott was able to reconstruct it in detail from Banneker's recollection. Equally untrue are legends that Thomas Jefferson as Secretary of State invited Banneker to luncheon at the White House. Jefferson during this period was in Philadelphia, the national capital had not yet been built, and there was no White House." Bedini, 1972, p. 403, Item 85 "William Loren Katz. Eyewitness, the Negro in American History. New York. Putnam Publishing Corp., 1967 pp. 19–31, 61–62.Brief account of Banneker's career and contributions, which are stated to have been in "the fields of science, mathematics, and political affairs," ... . Among the misstatements are the claims ... that George Ellicott worked with Banneker in the survey of Washington, that Banneker was appointed to the Commission at a suggestion made by Jefferson to Washington, and that Banneker selected the sites of the principal buildings. The fiction that Banneker re-created L'Enfant's plan from memory is again presented, and his almanacs are said to have been published for a period of ten years." Toscano, 2000. "Some writers, in an effort to build up their hero, claim that Banneker was the designer of Washington. Other writers have asserted that Banneker's role in the survey is a myth without documentation. Neither group is correct. Bedini does a professional job of sorting out the truth from the falsehoods."

Bedini, 1999, p. 132–136. "An exhaustive search of government repositories, including the Public Buildings and Grounds files in the National Archives, and various collections in the Library of Congress, failed to turn up Banneker's name on any of the contemporary documents or records related to the selection, planning and survey of the City of Washington. Nor was he mentioned in any of the surviving correspondence and papers of Andrew Ellicott and of Pierre Charles L'Enfant. ... Although the exact date of Banneker's departure from the survey is not specified in Ellicott's report of expenditures, it occurred sometime late in the month of April 1791, following the arrival of one of Ellicott's brothers. It was not until some ten months after Banneker's departure from the scene that L'Enfant was dismissed, by means of a letter from Jefferson dated February 27, 1792. This conclusively dispels any basis for the legend that after L'Enfant's dismissal and his refusal to make available his plan of the city, Banneker recollected the plan in detail from which Ellicott was able to reconstruct it. Equally untrue and in fact impossible is the legend that Thomas Jefferson as secretary of state invited Banneker to luncheon at the White House. Jefferson during this period was in Philadelphia, the national capital in Washington had yet not been built, and there was no White House." Cerami, 2002, pp. 142–143.

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Others involve his clock, his astronomical works, his almanacs and his journals.Multiple sources: Whiteman, Maxwell (1969). Benjamin Banneker: Surveyor and Astronomer: 1731–1806: A biographical note In Whiteman, Maxwell (ed.) "The plan for a "Peace Office" in the Government of the United States, which also appeared in this issue (Banneker's 1793 Philadelphia almanac) has been attributed to Banneker. According to Edwin Wolf 2nd, Librarian of the Library Company of Philadelphia from whose institution these copies have been made, the "Peace Office" is the work of Dr. Benjamin Rush." Bedini, 1972, p. 186. "Another important item in the 1793 almanac was "A Plan Of a Peace-Office for the United States," which aroused a good deal of comment at the time. It was believed by many to have been Banneker's own work. Even within recent decades its authorship has been debated. In 1947 it was identified without question as the work of Dr. Benjamin Rush, in a volume of his writings that appeared in that year." Bedini, 1972, p. 403, Item 85 "William Loren Katz. Eyewitness, the Negro in American History. New York. Putnam Publishing Corp., 1967 pp. 19–31, 61–62.Brief account of Banneker's career and contributions, which are stated to have been in "the fields of science, mathematics, and political affairs, ... ." Among the misstatements are the claims that Banneker produced the first clock made entirely with American parts, ... ."

Bedini, 1999, p. 43. "Banneker's clock was by no means the first timepiece in tidewater Maryland, as occasionally has erroneously been claimed. Timepieces were well known and available from the very earliest English settlements, ..." Although part of African-American culture, many of these accounts lack support by historical evidence. Some are contradicted by evidence.