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Oklahoma · NTEE C
Environment Nonprofits in Oklahoma
Givalgo Discover indexes 50 active environment nonprofits headquartered in Oklahoma. The list below is sorted by reported revenue on the most recent Form 990 indexed for each organisation.
Top 50 by reported revenue
From the most recent Form 990 indexed for each organisation. Click an org for full diligence detail.
Frequently asked questions about environment nonprofits in Oklahoma
Answers compiled from the IRS Form 990, BMF, Pub 78, and Auto-Revocation List.
Frequently asked questions about environment nonprofits in Oklahoma
Answers compiled from the IRS Form 990, BMF, Pub 78, and Auto-Revocation List.
- How many environment nonprofits operate in Oklahoma?
- Every IRS-registered environment nonprofit in Oklahoma appears in the Givalgo Discover index. The top 50 by reported revenue are listed on this page; the full set is searchable on discover.givalgo.ai.
- What's the largest environment nonprofit in Oklahoma?
- The single largest environment nonprofit in Oklahoma by reported total revenue is shown at the top of the list on this page, sourced from each organisation's most recent IRS Form 990 filing.
- How do I vet a environment nonprofit in Oklahoma before donating?
- Use Givalgo Discover's free profile for the organisation: it cross-references the IRS Auto-Revocation List, IRS Publication 78, and the IRS Business Master File, and exposes the latest Form 990 financials and governance signals on a single page.
- Are donations to Oklahoma environment nonprofits tax-deductible?
- Federal deductibility is determined by IRS Publication 78 status, not state location. Donations to a Pub 78-listed environment nonprofit in Oklahoma are tax-deductible at the federal level; Oklahoma state tax treatment may differ.
- Where do environment nonprofits in Oklahoma file their Form 990?
- All US tax-exempt organisations file Form 990 with the IRS at the federal level — there is no state-specific filing for the federal exemption itself. Oklahoma state charity registration is a separate state-level requirement.