Jerry Costello II spent six years as a police officer in Sauget, Illinois, before entering the public sector. He was appointed to the Illinois House of Representatives in 2011, representing a district that includes parts of Cahokia, Chester, Columbia, and other nearby towns. Costello II later transitioned to executive roles, serving on Governor J. B. Pritzker's Agriculture Transition Committee and being appointed Director of the Illinois Department of Agriculture in 2020.

Jerry Costello II's political identity is marked by an ideologically agile approach, particularly in his legislative and executive roles. His background as a police officer and his appointment to lead the Illinois Department of Agriculture reveal a pragmatic yet nuanced understanding of regional needs. Costello II's legislative record shows an unexpected convergence with opposing factions on environmental regulations, revealing a highly calculated approach to protecting regional industrial interests. His rhetorical style often emphasizes local impacts and community-specific solutions, making his broader policy positions both intriguing and complex.