Green criminology, now more than 25 years old, has developed primarily through descriptive, theoretical discussions and qualitative assessments. That material is essential to any literature and can stimulate quantitative studies. Green criminology is less empirically orientated than conservation criminology. Quantitative studies are an essential aspect of research and add important information about a subject area that can also shape the kinds of knowledge generated about a topical area or issue. The present study reviews quantitative knowledge in green/conservation criminology from 117 studies organized into five areas: (1) environmental justice; (2) the distribution and consequences of pollution; (3) the social control of environmental crime; (4) environmental social movement research; and (5) harms against (nonhuman) animals. These quantitative studies are important not just for the information they produce, but also as a method for communicating with other disciplines and with other researchers within criminology who are partial to quantitative research over other forms of knowledge production.