In the 2010 census, the female population of Seattle was right at 50%.
It certainly isn't 2:1 - that was hyperbole - but it's bad. And it doesn't actually take a large absolute difference to produce huge changes in behavior. A standard economic model of this fact is explained nicely here: http://marginalrevolution.com/marginalrevolution/2010/02/rev... In the efficient market limit, an arbitrarily small perturbation in the effective gender ratio produces arbitrarily large changes in outcomes.
2010 estimate: 608,658
Assuming every one of those 53,742 people was male, the ratio would go from 50% female to 45.9% female.