The property numbering map entitled, "The House Number and Tax Map of the City of Roxboro", dated May 10, 1966, is adopted as the official property numbering map of the city, and all property numbers assigned shall be assigned in accordance with this numbering map. No property numbers shall be used or displayed in the city except numbers assigned in accordance with the official numbering map. The property numbering map shall be kept on file in the office of the City Manager.
(`90 Code, § 18-66)