Most people who live alone know they’re paying a premium compared to their friends who split rent with partners or roommates. But in no city is this “singles tax” more expensive than in New York City.

In more-expensive cities, the "singles tax" can be as high as $19,500. Cohabitating renters in the U.S. save a collective $14,000 a year by living together. Zillow's search filters and tools can help ...