Dataset of the study by Degli Antoni, G. and Faillo, M. "The Number but not the Variety of Nonprofit Organizations Affects Donations: Evidence from an Experiment"
Data on James V Brown Library from their 2022 Form 990, provided by Cause IQ, which provides data and tools to help companies develop their nonprofit clients and nonprofits find foundation funding.
ProPublica's Nonprofit Explorer lets you view summaries of 2.2 million tax returns from tax-exempt organizations and see financial details such as their executive compensation and revenue and expenses