Fiscal year ending 2025. Filed on November 16, 2025.
2121 Massachusetts Ave NW
Washington, District of Columbia 20008
Philosophical Society of Washington (EIN: 52-1073697), also known as Psw Science, has filed an IRS Form 990 since fiscal year 2022. In its fiscal year 2025 IRS Form 990 filing, Philosophical Society of Washington, a 501(c)(3) charitable organization, reported compensation for 0 out of 0 total employees.
Revenue
Expenses
Employee compensation
No compensated employees were reported for this year (employee data available for 2022).
Educational, scientific, and professional society organized in 1871 by Joseph Henry (the first secretary of the Smithsonian) providing science lectures, education, and discussion to its members and the public for the promotion of science, the advancement of learning, and the free exchange of views among its members and attendees on scientific subjects. Lectures and the accompanying discussion are recorded and made available to all, free of charge, on the Society's video channels.
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