This graph shows the known characters of Middle-Earth and Aman divided by race and sex. Some races, such as Ents and Eagles, have been excluded.
A majority of the characters described in Tolkien's works are either Men or Hobbits. Men awoke at the start of the First Age of the Sun and much of the later history of Middle-earth revolves around the doings. Considering how long they had been in Middle-earth, very few Men are known by name. The Hobbits are very well-documented due to their interest in tracing their own ancestry and drawing family trees. Despite this, the origin of Hobbit is unknown and all known characters are from the second half of the Third Age.
Only 18 % of the characters Tolkien described in his works are female. This does not mean that his world lacks women but rather that most of his stories are not centered around their point of view.
There is only one female Dwarf described, Ds. She had two sons, Fli and Kli, who perished in the Battle of Five Armies while defending their mortally wounded uncle Thorin. It was this act of courage that made Ds one of very few women included in Dwarven genealogies and the only one mentioned in Tolkien's works.