We evaluated changes in population attributable risk of “4C” antibiotics for community-associated Clostridioides difficile infection in Ontario (2017–2024). Contributions from clindamycin, cephalosporins, and fluoroquinolones declined, whereas amoxicillin-clavulanate increased and became the leading contributor by 2022, highlighting a potential emerging target for outpatient antimicrobial stewardship.