Objectives: To examine caregiver factors associated with unmet needs for care of older adults.; Design: Population-based surveys of caregivers and older adult care recipients in the United States in 2011.; Setting: 2011 National Health and Aging Trends Study and National Study of Caregiving.; Participants: Family caregivers (n = 1,996) of community-dwelling older adults with disabilities (n = 1,366).; Measurements: Disabled care recipient reports of unmet needs for care in the past month with activities of