The values on that map are a little frustrating, have we got anything which offers more precision for those enormous 1-91 and 108-205 ranges? I look at that and think "Across the country the ratio could only vary between about 9 men for every 10 women and 9 women for every 10 men and the diagram would still be totally correct - is that even really significant?".
("Is that even really significant?" is a whole other question that I'm sure someone can easily answer. I don't have any intuition about how skewed a gender ratio has to be for it to be noticeable to a member of that population, certainly if someone told me that there were only 9 women for every 10 men in a city I wouldn't immediately think my chances of hooking up would be hurt too much...would they?)