The article is interesting, but (unless I missed something) doesn’t really spend much time answering it’s headline question beyond these couple of paragraphs
The ratios vary by geography, in part because of the presence of certain institutions and industries with gender imbalances. In the most populous counties in the West, this is especially discernible. San Diego, for instance, has several male-dominated military bases, which is reflected in the sex ratio. In Austin, San Francisco, Seattle and San Jose there are plentiful jobs in tech, a sector where men account for around three-quarters of the workforce.
This is in contrast to areas with large numbers of colleges or universities, which typically have more women, according to a Census Bureau report from May.
Adding to the imbalance are the effects of historic racism in the U.S., including high rates of incarceration and the mortality gap, which have lowered the number of men in some communities, said Karen Guzzo, director of the Carolina Population Center at the University of North Carolina.