Sanctuary for Families, a New York nonprofit that provides counseling and other services to victims of domestic violence and their children, reported a 15 percent increase in volunteers from its website from Nov. 8 to April 1.

“The through line is we’ve heard from many people who are reaching out for the first time,” Emily Lo Bue, its director of corporate and volunteer relations, said. Sanctuary for Families uses about 3,000 volunteers a year, she said, including lawyers who donate their time or whose time is donated by law firms.

The higher numbers came as City Hall completed a study, which was started before the election, that said 48 percent of New Yorkers volunteer in some way — more than three times the rate reported in the Corporation for National and Community Service’s annual “Volunteering and Civic Life in America Report” last year. The New York study was based on survey interviews with more than 850 people in western Queens from August 2016 to March 2017.

Paula L. Gavin, the chief service officer in the de Blasio administration, said there had been “anecdotes and instincts” that more volunteering was happening in New York than the national numbers indicated. The survey provided data as city officials looked at ways to strengthen volunteer networks around the city.

The national report said volunteers tended to be people who were older, native-born English speakers and college-educated, and owned their own homes and had higher incomes. In the city, Ms. Gavin said, “The most striking pattern we found in the course of the study was high levels of volunteering even among New Yorkers who don’t fit many of these characteristics.”

Among the people interviewed, 45.7 percent of those earning $20,000 to $40,000 said they did some type of volunteer work — a slightly smaller percentage than among those earning $40,000 to $100,000 (48.5 percent) or those making more than $100,000 (50 percent).

As for education, 51.9 percent of those with college degrees did volunteer work and 63.3 percent with graduate degrees did so, according to the New York study. But the percentage for those who did not finish high school was 45.7 percent, slightly higher than for those with high school diplomas.