All adults living in New York City are officially eligible to receive coronavirus booster shots, following decisions made Friday by federal regulators to expand eligibility for the shots across the country beyond those who have underlying conditions, live or work in high-risk settings or are over 65.

The decisions by the Food and Drug Administration and the Centers for Disease Control and Prevention brought federal guidance in line with how New York City officials had already started to interpret it. City leaders advised health providers on Monday that they should not turn away adults seeking a booster shot, provided enough time had passed since they were first vaccinated.

A spokesman for Mayor Bill de Blasio said Friday that 732,000 adults had received booster shots so far in New York City.

“Let’s get that number up a lot more, particularly as we’re getting ready for the colder months,” Mr. de Blasio said this week. “That’s how we fight back Covid in the colder months, and that’s how we get ready for something wonderful: the holidays.”

Here’s what you need to know about getting a coronavirus booster shot in New York City.

Who is eligible for booster shots?

The F.D.A. on Friday authorized Pfizer-BioNTech and Moderna boosters for all adults, provided it has been at least six months after they completed the initial two-dose regimen. Then the C.D.C. endorsed the boosters later on Friday, after its panel of independent experts recommended them.

All adults who received the single-dose Johnson & Johnson vaccine are also eligible for a booster, so long as it has been at least two months since they received the shot.

Where can I get my booster shot in New York City?

New Yorkers can get booster shots at a number of places, including pop-up vans and buses, churches, local pharmacies, community health clinics and even at home.

To stay updated on the rotating schedule for pop-up and mobile sites, head to the city’s Vaccine Command Center.