Findings reveal that the offending perimeter length is a factor of criminal achievement in that mobile offenders reported higher financial earnings from crime than immobile offenders. Greater distances traveled for crime were also generally associated with higher criminal earnings, but this was more significant for predatory offenders than market offenders. The term, criminal mobility, refers to distances traveled by offenders to commit their crimes. Offenders either commit crime while in travel or travel to commit crime. A recurrent finding in research suggests that offenders travel relatively short distances when committing their crime. In this study of incarcerated offenders, the question was presented on what is the utility of travel for offenders. The measure of an individual’s offending perimeter considers the capacity and willingness of many offenders to move beyond their familiar confines. The data was derived from a sample of 268 male inmates from the residing population of 5 Federal prisons in Quebec, Canada. Tables, notes, references and appendix