https://www.irs.gov/charities-non-profits/annual-electronic-filing-requirement-for-small-exempt-organizations-form-990-n-e-postcard
Annual electronic filing requirement for small exempt organizations — Form 990-N (e-Postcard) |...
Small tax-exempt organizations can use Form 990-N, Electronic Notice (e-Postcard), instead of Form 990 or 990 EZ to meet their annual reporting requirements.
electronic filingexempt organizationsform 990annualrequirement
https://www.irs.gov/charities-non-profits/contact-irs-exempt-organizations
Contact IRS exempt organizations | Internal Revenue Service
Contact information for IRS Exempt Organizations.
internal revenue serviceexempt organizationsirs
https://www.irs.gov/statistics/soi-tax-stats-charitable-and-exempt-organizations-statistics
SOI Tax Stats - Charitable and exempt organizations statistics | Internal Revenue Service
Find statistics here for charitable tax exempt organizations, private foundations, and the unrelated business income of exempt organizations. There's also...
internal revenue serviceexempt organizationssoitaxstats