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Mammoth Lakes Friends of the Library

Mammoth Lakes, California · EIN 30-0266319 · Education · tax-exempt since 2004

D

Charity Clarity grade D (score 49.9 of 100), based on the Form 990 for the year ended September 2025.

Graded against 31,970 education nonprofits with revenue under $100K filing the same form. A = top 10%, B = next 20%, C = middle 40%, D = next 20%, F = bottom 10%.

What goes into the grade

MeasureThis charityScore (0–100)
ReservesMonths of spending covered by unrestricted net assets.320.3 months0
GovernanceBoard independence, key policies and audit, per the 990.74% of practices74
Margin stabilityHow steady the surplus or deficit is year to year.67
Revenue spreadHow much revenue rests on one type of income.65% from one source47
Filing recordOn-time, complete filings, year after year.100%100

Scores compare this charity with its peer group; 100 is best. How Charity Clarity rates charities.

Year by year

20212022202320242025grey: revenue · green: spending
Year endedFormRevenueSpendingSurplusNet assetsMonths of spendingStaffGrade
Sep 2025Form 990$86K$27K$59K$730K320.30D
Sep 2024Form 990$80K$34K$47K$671K239.20D
Sep 2023Form 990$201K$27K$175K$624K280.80D
Sep 2022Form 990-EZ$84K$36K$48K$448K151.1F
Sep 2021Form 990-EZ$70K$41K$28K$400K116.6D

From the organisation’s own IRS filings. “Months of spending” is total net assets divided by a month of that year’s spending. A blank grade means that year was not rated.

Read the filings

Every figure here comes from the returns this charity filed with the IRS. These sites show the full returns and more about the organisation:

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