The reported, or estimated annual total of completed, intentional homicides committed with a firearm, in years descending. Fatal 'legal intervention' killings such as law enforcement shootings found to be justifiable homicides are counted separately.

Where a jurisdiction's published count of 'annual homicide' includes cases of attempted (uncompleted) homicide, these figures have been disaggregated wherever possible.

In the United States, this category is confused by inaccurate and conflicting data published, suppressed or labelled as unreliable by the Centers for Disease Control and Prevention (CDC) and the Federal Bureau of Investigation (FBI). Suppression can result in zero values where in fact homicides did occur.

National statistics may vary depending on the authority who published them. In general, national health authorities produce homicide counts lower than those published by national police or justice agencies. This is due to differing definitions, reporting methods, and resources devoted to collecting and publishing data.

Incomplete classification by local agencies can also result in a significant proportion of events being categorised as 'unknown cause' or similar.

Before quoting these datasets, please follow the citation links for a description of the considerable differences between them and the reasons for data suppression.