“I think what we’re seeing, unquestionably, is an unleashing of the forces of hate all over this country,” Mayor Bill de Blasio said at a news conference on Tuesday. He said New York has “a different reality in some ways” but the national backdrop has “put everyone on edge and it’s created a lot of division.”

City officials on Tuesday vowed to increase their efforts to reverse the trend, including by opening a new Office for the Prevention of Hate Crimes within the mayor’s office this summer.

Created by a law passed by the City Council in January, the new office will be charged with coordinating responses to hate crimes across city agencies, developing prevention strategies and fostering healing for victims.

The rise in hate crimes, Mr. de Blasio said, is “an unacceptable reality and we’re going to fight it with everything we’ve got.”

There have been 110 anti-Semitic crimes reported so far this year, compared to 58 at the same time last year. In some of New York’s Orthodox Jewish enclaves, anti-Semitic assaults, slurs and swastika graffiti have grown so common that people are at risk of becoming numb to them, community leaders said.

Jewish groups have been concerned that an ongoing measles outbreak, centered in the ultra-Orthodox community, might be contributing to an atmosphere of anti-Semitism. But Evan Bernstein, the director of the Anti-Defamation League for New York and New Jersey, said that while he had heard from community leaders about dozens of incidents of anti-Semitic harassment involving measles, very few have been formally reported.

In the Williamsburg neighborhood of Brooklyn last week, a teenager riding a bicycle slapped an Orthodox Jewish man in the head and knocked off his hat, the police said.