According to the statistics site that the OP used, 54 million Americans are single. [1] Ignoring the 62 million Americans that are under fifteen, we find that only 21% of American adults are available. [2] So if your area's ratio is 9:10 and ~80% of the people are taken, you end up with a 7:12 ratio among the singles (ignoring homosexuality).
[1] http://www.statisticbrain.com/online-dating-statistics/
[2] https://www.cia.gov/library/publications/the-world-factbook/...