No, Manchester is not a dangerous city. Manchester ranks as the #155 safest out of 320 major cities over 100,000 people in the United States based on our analysis of the latest FBI Crime Data. Keep in mind that are always safe and dangerous parts of any city, so even though Manchester might be considered safe you still need to be aware of where you are.
Compared to other big cities, the violent crime rate in Manchester ranks 116th highest in America -- 8.0% worse than US average violent crime rate. The property crime rate in the ranks 178th highest in the United States -- 14.71% better than US average property crime rate. Note the latest reporting year from the FBI was 2020 and that no city in America is 'dangerous'. Despite the uptick in murders, it's nothing like you'd see in Tijuana or Caracas where the murder rate is 2x any American city.