The Thacher & Straitsmouth Islands Association is a nonprofit organization dedicated to the historic preservation of Thacher Island, Straitsmouth Island, and their associated lighthouses, buildings, and facilities. With a 2024 operating budget of $580.3K and total revenue of $275.5K, the organization is supported by a diverse range of funders, none of which contribute 50% or more of its revenue. More information can be found on their website at www.thacherisland.org.