At our last LORE meeting (5/03/03), there was a very interesting discussion on organizations calling themselves 'Masonic' and being comprised of all women or a combination of women and men.
In checking further the following may be of interest (actual names and locations to best of my sources knowledge):
Ancient & Primitive Rite of Memphis Misra´m -
Mixed gender lodges in Los Angeles, Evansville, Ind., Villa Park, Ill., Detroit, Michigan, Cincinnati, Ohio
Men's lodge in suburban NYC, Women's lodge in suburban NYC
Le Droit Humain (all mixed lodges)
International Order of Co-Freemasonry - Website
American Co-Masonry - Website
9070 S. Douglas Blvd.
Women's Grand Lodge of Belgium - Website
Universalis in Manhattan
Silence in Manhattan
Grand Lodge of Ancient Universal Mysteries - Website
Several Lodges in New York and throughout the US.