Data update history
October 18, 2025
Posted financials
Added Form 990PF for fiscal year 2024
July 17, 2024
Posted financials
Added Form 990PF for fiscal year 2023
November 25, 2023
Posted financials
Added Form 990PF for fiscal year 2021
July 9, 2023
Posted financials
Added Form 990PF for fiscal year 2022
November 2, 2021
Posted financials
Added Form 990PF for fiscal year 2020
Nonprofit Types
Grantmaking organizationsPrivate foundationsFamily foundationsPrivate non-operating foundationsCorporate foundationsCharities
Issues
No issues found
Characteristics
Provides grantsPartially liquidatedState / local levelTax deductible donationsNo full-time employees
General information
- Address
- 5000 Westown Pkwy Ste 400
- West Des Moines, IA 50266
- Metro area
- Des Moines-West Des Moines, IA
- County
- Polk County, IA
- Phone
- (515) 223-4000
IRS details
- EIN
- 42-1234012
- Fiscal year end
- December
- Taxreturn type
- Form 990-PF
- Year formed
- 1985
- Eligible to receive tax-deductible contributions (Pub 78)
- Yes
Categorization
- NTEE code, primary
- T20: Private Foundations
- NAICS code, primary
- 813211: Grantmaking Foundations
- Parent/child status
- Independent
Free account sign-up
Want updates when William C Knapp Charitable Foundation has new information, or want to find more organizations like William C Knapp Charitable Foundation?
Create free Cause IQ account