# Siff

Youth development nonprofit in Seattle, Washington 98109. EIN 91-1489660. Data as of November 8, 2026.

Page: https://backpr.com/find/nonprofit/911489660-siff

## IRS facts

- Type: Youth development (IRS activity code O99Z)
- Tax status: 501(c)(3), contributions deductible, recognized 1991
- Source: IRS Business Master File, posted October 13, 2026: https://www.irs.gov/charities-non-profits/exempt-organizations-business-master-file-extract-eo-bmf

## How it compares

- Revenue rank: 4 of 113 youth development nonprofits in Seattle.
- Revenue $9,495,517 is in the top 10% of 326 youth development nonprofits in Washington; median $242,921.
- Source: IRS Business Master File, posted October 13, 2026; BackPR analysis.

## Local context

- King County, Washington: about 441,421 children under 18 (U.S. Census Bureau, July 1, 2024): https://www2.census.gov/programs-surveys/popest/datasets/2020-2024/counties/asrh/cc-est2024-agesex-all.csv
- 1,342 youth and community nonprofits in this directory in the county: 3.0 per 1,000 children.
- Licensed programs in Seattle: 273 licensed child care centers, 71 school-age programs: https://backpr.com/find/washington/seattle
- Washington rules: https://backpr.com/resources/states/washington

## Questions

**What is Siff's EIN?**

Siff's EIN (Employer Identification Number) is 91-1489660. It is the nine-digit number the IRS uses to identify the organization. Source: IRS Exempt Organizations Business Master File posted October 13, 2026.

**Is Siff a nonprofit?**

Yes. The IRS lists Siff in Seattle, Washington as tax-exempt under section 501(c)(3), recognized since 1991. This is from the IRS Business Master File posted October 13, 2026. Status can change, so check its current status on the IRS Tax Exempt Organization Search before you donate.

**Are donations to Siff tax-deductible?**

Yes, the IRS lists gifts to Siff as tax-deductible (IRS Business Master File posted October 13, 2026). How much you can deduct depends on your own taxes, and this is not tax advice. Check its current status on the IRS Tax Exempt Organization Search before you donate.

**What does Siff do?**

The IRS classifies Siff as: Youth development. It has not filed a Form 990 or 990-EZ with a mission statement that we have loaded.

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Data as of November 8, 2026. Sources: IRS Business Master File, IRS Form 990 series e-file data, U.S. Census Bureau. No officer or staff names are published.