# WILLIAM AND CLAIRE DART FOUNDATION

WILLIAM AND CLAIRE DART FOUNDATION is a Private Foundation based in MASON, United States.

## Overview

- **Organization type:** Private Foundation
- **Headquarters:** MASON, United States
- **Region:** North America

## About

WILLIAM AND CLAIRE DART FOUNDATION is listed by the Internal Revenue Service as a private grantmaking foundation exempt under Section 501(c)(3), with employer identification number 38-2562664. The IRS filing address is in MASON, MI, United States. For the tax period ending November 2025, the IRS Exempt Organizations Business Master File lists year-end book assets of USD 56,527,324 and an IRS-computed Income Amount of USD 174,976,105. For private foundations, this extract field combines total revenue with specified cost-of-goods and cost-basis amounts from Form 990-PF. The IRS ruling date on file is October 1985. These tax-filing amounts are not assets under management or net profit.

## Questions

### What is WILLIAM AND CLAIRE DART FOUNDATION?

The IRS lists WILLIAM AND CLAIRE DART FOUNDATION as a private grantmaking foundation exempt under Section 501(c)(3), with EIN 38-2562664.

### What filing locality does the IRS record for WILLIAM AND CLAIRE DART FOUNDATION?

The IRS filing address is in MASON, MI, United States.

### What book assets does the IRS report for WILLIAM AND CLAIRE DART FOUNDATION?

For the tax period ending November 2025, the IRS lists year-end book assets of USD 56,527,324.

### What does the IRS Income Amount for WILLIAM AND CLAIRE DART FOUNDATION represent?

For the tax period ending November 2025, the IRS-computed Income Amount is USD 174,976,105. For private foundations, this extract field combines total revenue with specified cost-of-goods and cost-basis amounts from Form 990-PF.

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Updated: 2026-10-15T14:30:23.520Z

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