Directories of heads of households have been published for major cities in Maine. The New England Historic Genealogical Society has an extensive collection of directories. The Family History Library has the following directories for Portland from 1823 to 1934:
Portland (Maine) City Directories. Woodridge, Connecticut: Research Publications, 1980-1984. (On 29 Family History Library films starting at 1377315; on 41 fiche 6044325-39.)
- New England Ancestors
- US City Directories This web site identifies printed, microfilmed, and online directories and their repositories.