Informal care is a major source of long-term services and supports (LTSS) for older adults in the U.S. However, the increasing gap between available family caregivers and those needing LTSS in coming years warrants better understanding of the balance between informal and formal home or community-based LTSS to meet the growing demand. The current study aimed to 1) identify patterns of informal and formal LTSS use among community-dwelling individuals, and 2) examine if the supply of formal LTSS predicts the use of informal care. These aims were investigated by linking the market supply of formal LTSS at the state-level to the Health and Retirement Survey data (N = 7,781). Results provide important empirical evidence that patterns of informal and formal LTSS use among older adults are heterogeneous and market supply of formal home and community-based services (HCBS) significantly predicts the use of informal care. Most older adults rely on informal care in combination with some formal supports, suggesting that the two systems work in tandem to meet the growing needs of LTSS. This offers important implications for states allocating resources to meet the LTSS needs of older adults and individuals with disabilities since states play key roles in U.S. long-term care policies.