Because of the destruction of the 1926 census for Northern Ireland during World War II, the first census that survives for the city and county of Londonderry, after 1911, is that of 1937. This means that each annual edition of Derry Almanac is the closest census substitute for Derry city between 1912 and 1936. For genealogists, the Derry Almanac and Directory of 1930 names 9, 084 heads of household and family businesses in Derry city. This list of inhabitants, in alphabetical order by surname, contains these 5 fields: Surname of Head of Household, First Name of Head of Household, Street Address, House Number, and Page Number of the listing. Author Brian Mitchell has re-arranged the contents of the 1930 almanac in a convenient tabular alphabetical format, so researchers can access this vital information with relative ease