They're also not taxed like a state, citizens resident there aren't taxed on income, except for social security, which they receive the benefits of. So no, they're not represented, but they also don't have the same burdens.

Edit: it does sound like they might get shorted on Medicare benefits? It's unclear.

Edit2: this article looks at the difference between spending and taxes, in 2011, for all states and Puerto Rico: https://www.economist.com/blogs/dailychart/2011/08/americas-...