The New York Public Library is open on Sundays, but the hours vary depending on the location. According to their website, libraries are open across the Bronx, Manhattan, and Staten Island on Sundays. However, it is recommended to check the location finder on their website for current hours and status before visiting. The Yelp search results also show that there are libraries open on Sundays in Brooklyn, NY, including the Brooklyn Public Library and the New York Public Library - Stephen A. Schwarzman Building. It is worth noting that some branches may have limited hours on Sundays, so it is best to check the specific librarys website or call ahead to confirm their hours of operation.