# CARLOS AND MARGUERITE MASON FOUNDATION

CARLOS AND MARGUERITE MASON FOUNDATION is a Private Foundation based in SAINT LOUIS, United States.

## Overview

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

## About

CARLOS AND MARGUERITE MASON FOUNDATION is listed by the Internal Revenue Service as a private grantmaking foundation exempt under Section 501(c)(3), with employer identification number 58-1996431. The IRS filing address is in SAINT LOUIS, MO, United States. For the tax period ending December 2024, the IRS Exempt Organizations Business Master File lists year-end book assets of USD 102,787,299 and an IRS-computed Income Amount of USD 43,425,976. 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 January 2006. These tax-filing amounts are not assets under management or net profit.

## Questions

### What is CARLOS AND MARGUERITE MASON FOUNDATION?

The IRS lists CARLOS AND MARGUERITE MASON FOUNDATION as a private grantmaking foundation exempt under Section 501(c)(3), with EIN 58-1996431.

### What filing locality does the IRS record for CARLOS AND MARGUERITE MASON FOUNDATION?

The IRS filing address is in SAINT LOUIS, MO, United States.

### What book assets does the IRS report for CARLOS AND MARGUERITE MASON FOUNDATION?

For the tax period ending December 2024, the IRS lists year-end book assets of USD 102,787,299.

### What does the IRS Income Amount for CARLOS AND MARGUERITE MASON FOUNDATION represent?

For the tax period ending December 2024, the IRS-computed Income Amount is USD 43,425,976. 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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