All data in this website comes from the Mexican Justice System, in addition the government health agencies track the number of homicides, but that information is updated much less frequently. If you use the data I would appreciate a link back. Some states may be missing from the municipio data because they haven't reported their data, if this happens wait a couple of days to download the data again.
INEGI data is available from the R package mxmortalitydb and the INEGI website. To create the maps I used the R package mxmaps
This information is constantly updated from the Secretariado Ejecutivo del Sistema Nacional de Seguridad Pública and the INEGI
Source for this website: GitHub
Population data comes from the CONAPO. Monthly population was obtained by linear interpolation
The state and municipio codes come from the INEGI's Catálogo de entidades federativas, municipios y localidades del INEGI
All crimes from all categories at both the state and municipality levels are completely available
Victim data comes from the special SNSP reports