Yes, your Junior League dues are deductible as long as you do not receive a tangible benefit in return and you itemize your deductions.
See
https://www.ajli.org/?nd=em_faq_list
To enter charitable contributions::
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Type in charitable contributions in the search box, top right of your screen, click the
magnifying glass
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Click the jump to charitable contributions link in the
search results
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Follow to prompts and online
instructions