Pretty much every USA city sucks for single men under 40. A few are less worse then others however.
The New, Interactive Singles Map. The top is adjustable for age and you click each city and adjust the population. This is not good news for anyone who thinks New York City is not the place to meet single women aside from horrible logistics this map only counts married couples and not those who cohabitate which is more common in NYC due to the expense. To make matters worse plenty of men earn high incomes which make competition for attractive women even more intense. Sorry to ruin your day but unless you want to date women at age 40+, Make six figures, New York City Metro is no single mecca for men in the USA. Boston is not that great either similar to NYC only smaller.
About Me? I lived here most of my life and yes I am still single been to Boston quite a few times too...