Youth and community nonprofits / California / Mill Valley

Swimming and water sports

Marin County Swim Association

A tax-exempt nonprofit in Mill Valley, California, classified by the IRS as swimming and water sports. For the year ending Dec 2023 it reported $369,711 in revenue and $383,370 in expenses.

Data as of November 8, 2026Markdown copy JSON data

What it says it does

“Provide the local community the opportunity to learn and play water polo”From the organization's Form 990 for the year ending Dec 2023, as written (including spelling); all-capital text shown in normal capitalization.

IRS facts

Type: Swimming and water sports (IRS activity code N67)

Mailing city (IRS): Mill Valley, California 94941

EIN: 87-4789788

Tax status: 501(c)(3), eligible to receive tax-deductible donations; IRS-recognized as tax-exempt since 2022, per IRS records posted October 13, 2026.

Revenue on its latest IRS filing: $369,711 (year ending Dec 2023)

Check its status on IRS Tax Exempt Organization Search · Filings on ProPublica Nonprofit Explorer

Marin County Swim Association finances

From the annual returns the group files with the IRS (Form 990, or the shorter Form 990-EZ for smaller groups), 1 filed year. Net assets are what it owns minus what it owes; management and general is office, admin and insurance cost. A dash means not reported (the short form does not ask for employees or volunteers). Each figure links to that year's return. A year is left out when no return is in the IRS e-file data; that does not mean the group was inactive.

Year ending	Dec 2023
Total revenue	$369,711
Total expenses	$383,370
Total assets	$0
Liabilities	$0
Net assets	$0
Employees	2
IRS form	Form 990

Where the money goes, year ending Dec 2023

Programs $383,370 (100%)
Management and general $0 (0%)
Fundraising $0 (0%)

Where the money comes from, year ending Dec 2023

Gifts and grants $369,711 (100%)
Program fees $0 (0%)
Investment income $0 (0%)
Other $0 (0%)

People: 2 employees reported for the year ending Dec 2023. Counts only; BackPR does not publish names of officers or staff.

Only one return is loaded, so we show no growth label.

Source: IRS Form 990 Series Downloads (the returns open on ProPublica Nonprofit Explorer, which republishes the IRS files). Figures are as the organization filed them. California nonprofit.

How it compares

2 of 10 amateur sports nonprofits in Mill Valley when sorted from largest to smallest revenue. This shows size only, not quality. Groups with no reported revenue are listed last.

Size: revenue of $380,895 is higher than roughly 70 to 80% of the 2,432 amateur sports nonprofits in California that report revenue to the IRS (the city count above also includes groups with none). The median is $143,571.

Our analysis of the IRS Business Master File (posted October 13, 2026), using each group's latest reported revenue. Groups are sorted by revenue and split into ten equal bands, using all California groups of this type (Amateur sports, which covers several IRS activity codes). Size only, not a rating.

Around Mill Valley and its county

Marin County, California: the Census Bureau estimates about 47,838 children under 18 (July 1, 2024). This directory lists 184 youth and community nonprofits with a mailing ZIP code in the county, about 3.8 per 1,000 children. The count includes PTAs, arts and day care groups, so it is not a measure of places for kids.

This group's ZIP code is matched to the county that holds most of its area, so counts are approximate. County figures come from the Census Bureau's Vintage 2024 population estimates.

What is Marin County Swim Association's EIN?

Marin County Swim Association's EIN (Employer Identification Number) is 87-4789788. 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 Marin County Swim Association a nonprofit?

Yes. The IRS lists Marin County Swim Association in Mill Valley, California as tax-exempt under section 501(c)(3), recognized since 2022. 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 Marin County Swim Association tax-deductible?

Yes, the IRS lists gifts to Marin County Swim Association 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 Marin County Swim Association do?

In its own words on its Form 990 for the year ending Dec 2023: "Provide the local community the opportunity to learn and play water polo" The IRS classifies it as: Swimming and water sports.

How much money does Marin County Swim Association take in?

For the year ending Dec 2023, Marin County Swim Association reported total revenue of $369,711 and total expenses of $383,370 on its Form 990 (IRS Form 990 e-file data).

Do you run this organization?

Tax-exempt since 2025 · EIN 39-3822535

Amateur sports competitions

Harbor Point Charitable Foundation

Mill Valley, CA 94941

Tax-exempt since 2004 · EIN 30-0276087

All youth and community nonprofits in Mill Valley

Source: IRS Exempt Organizations Business Master File, posted October 13, 2026. We list 501(c)(3) organizations whose IRS activity code is youth development, amateur sports, camps and recreation, parent-teacher groups, children's services, child day care or arts education. We show the city and ZIP code only, never a street address or contact person. A listing is not an endorsement.

Data as of November 8, 2026. Sources: IRS Business Master File (posted October 13, 2026), IRS Form 990 series e-file data, U.S. Census Bureau population estimates (July 1, 2024), state child care licensing records in the BackPR finder. Growth labels, ranks and percentiles are BackPR's own calculations.

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