Samuel N & Mary Castle Foundation
Historical FunderHonolulu, Hawaii · EIN 99-6003321 · Private foundation
Grants paid (2024)$1.9M
Organizations funded1
Typical grant$1,936,030
Total assets$52.2M
Half of its grants to organizations were between $1,936,030 and $1,936,030.
From the return
How to apply
The foundation filed the following application information (Form 990-PF Part XV, tax year 2024):
| Contact | SAMUEL N MARY CASTLE FOUNDATION |
|---|---|
| Address | 733 BISHOP STREET 1275, HONOLULU HI 96813 |
| Phone | 8085221102 |
| SNANDMARYCASTLE@HAWAII.RR.COM | |
| Form and materials | SEE FOOTNOTE |
| Deadlines | SEE FOOTNOTE. |
| Restrictions | SEE FOOTNOTE |
Copied as filed. Deadlines on a tax return describe the foundation's usual process; they are not confirmation of a current open cycle.
Where it gives
0% of grants went outside Hawaii.
Grants paid in tax year 2024
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| See Attached Statement | Honolulu, HI | See attached statement | $1,936,030 |
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2024 | $1,936,030 | 1 |
| 2023 | $1,853,412 | 1 |
Sources
- IRS Form 990-PF, tax year 2024, filed Nov 14, 2025 - IRS e-file batch, object ID 202513189349103671
- IRS Tax Exempt Organization Search for EIN 99-6003321
- Profile updated Nov 6, 2026
Facts on this page come from the foundation's own IRS Form 990-PF filings as published by the IRS. Grantvello does not know whether a foundation is accepting proposals right now: a past grant is not an open opportunity. Always confirm current guidelines with the funder before applying.