Need to Find a Bathroom in New York City? Try TikTok.

Alanna Ramirez, who grew up in New York and manages a brewery in the Bronx, follows Ms. Siegel’s TikTok account, has shared Ms. Siegel’s Google Map with friends and recently submitted a bathroom location. She said that she and her friends had been hoping for years that someone would create such a resource.

“When I saw the TikTok, I sent it to everybody,” Ms. Ramirez, 26, said. “I was, like, it’s finally happening.”

Wansoo Im, an associate professor at Meharry Medical College in Nashville, was inspired to create his own crowdsourced map, New York Restrooms, by the difficulty he encountered during a visit to the city with his family in 2004.

Almost two decades after he first published the map, Dr. Im, 56, says he still hears from people who use it. “I still get emails, time to time, how much they appreciate it,” he said.

Alice Xiao, who works in the technology industry, recently started a map app, Toodle Loo, that features crowdsourced bathroom locations in New York and other cities. She said she took pride in making bathrooms easier to find.

“There is power in community and sharing,” Ms. Xiao, 26, said.

For some people, restroom maps and lists are a necessity. In New York State, the Crohn’s and Colitis Fairness Act requires businesses to let those with certain medical conditions use employee-only restrooms if public restrooms are unavailable.