Index Every US public charity, on the record

Environment in Oklahoma

160 public charities the IRS codes as environment, 32 of them reporting revenue of $50,000 or more.

Organizations

Largest first

By revenue on the last return. Organizations that file Form 990-N report no figures and come last.

Organization	Return	Revenue
Oklahoma Land Conservancy IncTulsa	Form 990-N	No figure
Combat Veterans Motorcycle Association Oklahoma 10-7Ardmore	Form 990-N	No figure
Caring Limbs FoundationTulsa	Form 990 or 990-EZ	No figure
Reeds Friends IncTulsa	Form 990 or 990-EZ	No figure
Eco-Balance InitiativeStillwater	Form 990 or 990-EZ	No figure
Washington County Master GardenersBartlesville	Form 990-N	No figure
Prairie Conservation Action Program IncorporationVici	Form 990-N	No figure
Ardmore Regional Park AuthorityArdmore	None required	No figure
Oklahoma Prescribed Burn Association GroupStillwater	Group return	No figure
Lake Thunderbird Watershed Alliance IncNorman	Form 990-N	No figure

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By size

Under $50K114
$50K to $500K22
$500K to $1M3
$1M to $2.5M1
$2.5M to $5M2
Over $5M4
No figure on file14

Size classes

Peers are ranked inside these.

$50K to $500K
22 organizations, median $169K
$500K to $5M
6 organizations, median $1.63M
Over $5M
4 organizations, median $10.4M

Most common codes

Natural resources conservation and protection
NTEE C30
40
Environmental beautification
NTEE C50
17
Garden clubs
NTEE C42
15
Water resources, wetlands conservation and management
NTEE C32
14
Land resources conservation
NTEE C34
13
Environmental education
NTEE C60
13
Recycling
NTEE C27
10
Other environment
NTEE C99
7

Cities

Tulsa
36
Oklahoma City
32
Norman
8
Stillwater
7
Edmond
5
Ardmore
3
Broken Arrow
3
Broken Bow
3
Duncan
3
Tishomingo
3

Source. IRS public records, as of October 13, 2026. Financial figures are from the most recent return on file. Street addresses are not published here.

Peers. Public charities with the same focus group, state and size class, and a return no more than 33 months old.

Scope. The Index covers the 501(c)(3) organizations the IRS classes as publicly supported charities, in the 50 states and the District of Columbia. Churches, schools, hospitals and supporting organizations are classed separately and are not included.