There has been little research on United States homicide rates from a long-term perspective, primarily because there has been no consistent data series on a particular place preceding the Uniform Crime Reports (UCR), which began its first full year in 1931. To fill this research gap, this project created a data series on homicides per capita for New York City that spans two centuries. The goal was to create a site-specific, individual-based data series that could be used to examine major social shifts related to homicide, such as mass immigration, urban growth, war, demographic changes, and changes in laws. Data were also gathered on various other sites, particularly in England, to allow for comparisons on important issues, such as the post-World War II wave of violence. The basic approach to the data collection was to obtain the best possible estimate of annual counts and the most complete information on individual homicides. The annual count data (Parts 1 and 3) were derived from multiple sources, including the Federal Bureau of Investigation's Uniform Crime Reports and Supplementary Homicide Reports, as well as other official counts from the New York City Police Department and the City Inspector in the early 19th century. The data include a combined count of murder and manslaughter because charge bargaining often blurs this legal distinction. The individual-level data (Part 2) were drawn from coroners' indictments held by the New York City Municipal Archives, and from daily newspapers. Duplication was avoided by keeping a record for each victim. The estimation technique known as "capture-recapture" was used to estimate homicides not listed in either source. Part 1 variables include counts of New York City homicides, arrests, and convictions, as well as the homicide rate, race or ethnicity and gender of victims, type of weapon used, and source of data. Part 2 includes the date of the murder, the age, sex, and race of the offender and victim, and whether the case led to an arrest, trial, conviction, execution, or pardon. Part 3 contains annual homicide counts and rates for various comparison sites including Liverpool, London, Kent, Canada, Baltimore, Los Angeles, Seattle, and San Francisco.

Number and rate (per 100,000 population) of homicide victims, Canada and Census Metropolitan Areas, 1981 to 2024.

In 2024/25, there were 104 homicide offences recorded in London, the most of any region of the United Kingdom during that time period. North West England, which includes the large cities of Manchester and Liverpool, had 69 homicides and had the second-highest number of homicides. In the same reporting period, the constituent countries of Wales and Northern Ireland reported the fewest homicides, at 23, and 13 respectively. Homicides in the UK falling despite recent uptick Since 2002/03, all three jurisdictions of the UK; England and Wales, Scotland, and Northern Ireland, have seen their homicide rates fall, with Scotland seeing the steepest decline. The most significant decline in homicides in this period occurred between 2002/03 and 2014/15, which saw the annual number of homicides in England and Wales half from over 1,000 to around 500. This trend was suddenly reversed from 2015/16 onwards, with homicides rising to around 700 per year between 2016/17 and 2019/20. While homicides fell back to 535 in 2024/25, it remains to be seen if this pattern will continue. Knives used in almost half of all murders In 2024/25 a knife or other sharp instruments were used in approximately 46 percent of all murders in England and Wales, making this, by far, the most common method of killing in that reporting year. The overall number of knife homicides reached 262 in 2023/24, compared with 243 in the previous year. Firearm homicides were much rarer than knife homicides, with only 22 taking place in the same reporting year, and homicides caused by shooting only accounting for 3.9 percent of homicides overall.