The 30-day prevalence of urinary tract infection (UTI) among Finnish home care clients (N?=?6,887) estimated by the Resident Assessment Instrument was 4.5%, and 5.9% of the clients received antimicrobial agents, most commonly for UTI prophylaxis. Urinary catheter and female gender were the strongest factors independently associated with antimicrobial use and UTI. The Resident Assessment Instrument provides data that could be used when training home care providers and primary health care workers in the appropriate use of antimicrobial agents and UTI prevention.