Environment nonprofits in Wisconsin

Environment nonprofits in Wisconsin. Browse 1,084 public nonprofit profiles. Review organization identities, available filing years, and their complete CharitySense profiles.

Location refers to headquarters recorded in public sources, not an organization’s service area. Classification describes its reported category and does not assess its effectiveness.

Nonprofit profiles

  1. Milwaukee Area Land Conservancy

    EIN 710896837 · Headquarters: Franklin, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. Milwaukee Area Science Advocates Inc

    EIN 822362068 · Headquarters: Milwaukee, WI, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  3. Milwaukee Audubon Society Inc

    EIN 391233634 · Headquarters: South Milwaukee, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  4. Milwaukee Bonsai Foundation Incorporated

    EIN 464828946 · Headquarters: Fox Point, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  5. Milwaukee Bonsai Society Inc

    EIN 391637797 · Headquarters: Milwaukee, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  6. Milwaukee Parks Foundation Inc

    EIN 841808645 · Headquarters: MILWAUKEE, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  7. Milwaukee Philatelic Society Incorporated

    EIN 391548225 · Headquarters: Waukesha WI, WI, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  8. Milwaukee River Preservation Alliance

    EIN 473007378 · Headquarters: Glendale, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. Milwaukee River Preservation Association

    EIN 272367439 · Headquarters: Glendale, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  10. Milwaukee Riverkeeper Inc

    EIN 391846305 · Headquarters: MILWAUKEE, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. Milwaukee Urban Gardens Inc

    EIN 392009264 · Headquarters: MILWAUKEE, WI, USA · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-EZ

  12. Milwaukee Water Commons Inc

    EIN 832154946 · Headquarters: MILWAUKEE, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  13. Minerva Chain of Lakes Association

    EIN 991391251 · Headquarters: Danbury, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Mining Impact Coalition of Wisconsin Inc

    EIN 391800049 · Headquarters: Madison, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  15. Minong Flowage Association

    EIN 391902486 · Headquarters: Minong, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  16. Mirror Lake Association Inc

    EIN 391952277 · Headquarters: Lake Delton, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  17. Mississippi River Parkway Commission

    EIN 411331538 · Headquarters: MADISON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  18. Mississippi Valley Conservancy Inc

    EIN 391871201 · Headquarters: LA CROSSE, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  19. Mississippi Walleye Club

    EIN 421499690 · Headquarters: Platteville, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Monarch Butterfly Fund

    EIN 943299134 · Headquarters: MADISON, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  21. Monarch Society Fox River Valley Inc

    EIN 872377072 · Headquarters: APPLETON, WI, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  22. Mondovi Conservation Club Inc

    EIN 391463546 · Headquarters: MONDOVI, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  23. Monterey Dam Association

    EIN 384039660 · Headquarters: JANESVILLE, WI, US · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  24. Moody Lake Area Association Inc

    EIN 391790232 · Headquarters: menasha, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  25. Moose Lake Advancement Association

    EIN 844889206 · Headquarters: Nashotah, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  26. Mossy Rock Nature Group Inc

    EIN 883548512 · Headquarters: Eleva, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. Mountain Bay Foundation Inc

    EIN 994854899 · Headquarters: Appleton, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  28. Moxie Hoops

    EIN 991502134 · Headquarters: Middleton, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. Mundo Sostenible

    EIN 863385399 · Headquarters: MADISON, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  30. Muskego Lakes Land Conservancy Inc

    EIN 391781728 · Headquarters: Muskego, WI, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  31. Muskego Rod and Gun Club Inc

    EIN 460919688 · Headquarters: Waukesha, WI, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  32. Muskellunge Club of Wisconsin

    EIN 352227413 · Headquarters: MINOCQUA, WI, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  33. Musser Lake Association Llc

    EIN 831237616 · Headquarters: Phillips, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  34. Mwr Foundation Inc

    EIN 873804934 · Headquarters: KAUKAUNA, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  35. My Green Preserve Ltd

    EIN 923910197 · Headquarters: Wautoma, WI, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  36. Myrick Hixon Ecopark Inc

    EIN 391476960 · Headquarters: LA CROSSE, WI, USA · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990

  37. Nagashotah Shores Lake Association

    EIN 823613782 · Headquarters: Delafield, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. Namakagon Lake Association Inc

    EIN 391857612 · Headquarters: Cable, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  39. Namekagon River Partnership Inc

    EIN 454004593 · Headquarters: Hayward, WI, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  40. National Association of Insurance Women

    EIN 396127527 · Headquarters: De Pere, WI, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  41. National Association of State Conservation Agencies

    EIN 521316337 · Headquarters: Stevens Point, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  42. Nationwide Trophy Recycling Program Inc

    EIN 871798022 · Headquarters: Madison, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  43. Native Seed Project Inc

    EIN 820842724 · Headquarters: Osceola, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  44. Natural Resource Development Association Inc

    EIN 821266185 · Headquarters: Madison, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. Navarino Nature Center Inc

    EIN 391558573 · Headquarters: SHIOCTON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  46. Near North Trail Riders of Athalstane Inc

    EIN 391619600 · Headquarters: ATHELSTANE, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  47. Nearby Nature Milwaukee

    EIN 932643429 · Headquarters: MILWAUKEE, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  48. Nebagamon Lake Association Inc

    EIN 263469774 · Headquarters: Lake Nebagamon, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Nelson Lake Association Inc

    EIN 010800856 · Headquarters: HAYWARD, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. New Academy for Nature & Culture

    EIN 391952360 · Headquarters: MADISON, WI, USA · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  51. New Fane Mountain Bike Association

    EIN 995009219 · Headquarters: West Bend, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. New Found Lands Institute Inc

    EIN 391982440 · Headquarters: Madison, WI, US · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  53. New Organic Solutions Inc

    EIN 871219664 · Headquarters: Appleton, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  54. Nicolet Bird Club of Three Lakes

    EIN 462635526 · Headquarters: Three Lakes, WI, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  55. Norskedalen Nature & Heritage Center Inc

    EIN 391808906 · Headquarters: COON VALLEY, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  56. North American Lake Management Society Inc

    EIN 010372129 · Headquarters: MADISON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  57. North American Stormwater and Erosion Control Association of Wis

    EIN 134321082 · Headquarters: Madison, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  58. North and South Twin Lakes Riparian Association Inc

    EIN 391821388 · Headquarters: Phelps, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  59. North Central Conservancy Trust Inc

    EIN 391855857 · Headquarters: STEVENS POINT, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  60. North Central Wisconsin Master Gardeners Association Inc

    EIN 392034518 · Headquarters: Wausau, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. North Mendota Trails Inc

    EIN 204304108 · Headquarters: Madison, WI, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  62. North Sand Lake Association Inc

    EIN 391737154 · Headquarters: WEBSTER, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  63. Northeast Wisconsin Land Trust Inc

    EIN 391867891 · Headquarters: APPLETON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  64. Northeastern Wisconsin Orchid Society

    EIN 391577830 · Headquarters: DePere, WI, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  65. Northern Lights Master Gardeners Association Inc

    EIN 881964912 · Headquarters: Marinette, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  66. Northern Paddle & Trail Society

    EIN 391946137 · Headquarters: Rhinelander, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  67. Northwest Conservation League of Tomahawk Inc

    EIN 392011492 · Headquarters: Merrill, WI, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  68. Northwoods Community Garden Inc

    EIN 852838664 · Headquarters: Rhinelander, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  69. Northwoods Land Trust Inc

    EIN 311776860 · Headquarters: EAGLE RIVER, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  70. Northwoods Wildlife and Wetlands Club Ltd

    EIN 391778904 · Headquarters: Mercer, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  71. Northwoods Wildlife Center

    EIN 391323508 · Headquarters: MINOQUA, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. Northwoods Youth for Global Ecology

    EIN 474655389 · Headquarters: Phillips, WI, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  73. Oak Creek Land Trust Inc

    EIN 311639726 · Headquarters: Oak Creek, WI, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  74. Oak Outreach Wisconsin Inc

    EIN 394416641 · Headquarters: SUSSEX, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  75. Oakfield Conservation Club

    EIN 396076358 · Headquarters: OAKFIELD, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  76. Oakland Conservation Club Inc

    EIN 391516891 · Headquarters: Fort Atkinson, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. Oasis 2000 Inc

    EIN 391234501 · Headquarters: Rice Lake, WI, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  78. Oceanographic Pathways Institute Ltd

    EIN 814125169 · Headquarters: Appleton, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. Ocono County Lakes and Waterways Association

    EIN 391964814 · Headquarters: TOWNSEND, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. Oconto Falls Community Garden Corp

    EIN 334351833 · Headquarters: Oconto Falls, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  81. Oconto Sportsmens Club Inc

    EIN 811191489 · Headquarters: Oconto, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  82. Ocooch Mountain Broadheads Inc

    EIN 391631517 · Headquarters: Fennimore, WI, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  83. Okee Bay Mill Pond Lake Association Inc

    EIN 923646223 · Headquarters: Lodi, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  84. Olbrich Botanical Society Foundation Inc

    EIN 392002821 · Headquarters: MADISON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  85. Olbrich Botanical Society Inc

    EIN 391357247 · Headquarters: MADISON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  86. One Acre Foundation Inc

    EIN 880578694 · Headquarters: Juneau, WI, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  87. Oneida County Lakes and Rivers Association Inc

    EIN 813545944 · Headquarters: Hazelhurst, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  88. Osprey Lake Property Owners Association

    EIN 263298438 · Headquarters: Hayward, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. Otter Lake Booster Club Inc

    EIN 800443204 · Headquarters: Stanley, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Our Shared Planet Inc

    EIN 392037179 · Headquarters: BAYFIELD, WI, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  91. Outagamie Counyt Master Gardner Association

    EIN 392009258 · Headquarters: Appleton, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. Outdoors Forever Inc

    EIN 521497525 · Headquarters: MAUSTON, WI, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  93. Outrider Foundation Inc

    EIN 391947995 · Headquarters: Madison, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  94. Over the Garden Gate Clark County Master Gardeners

    EIN 861765831 · Headquarters: Neillsville, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Oxbow Lake Association Inc

    EIN 392042159 · Headquarters: Presque Isle, WI, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  96. Ozaukee Master Gardners

    EIN 810554096 · Headquarters: GRAFTON, WI, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  97. Paradise Farm Inc

    EIN 364813504 · Headquarters: West Bend, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  98. Parker Lake Association Inc

    EIN 391997217 · Headquarters: Oxford, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  99. Patten Lake Property Owners Assoc

    EIN 881084546 · Headquarters: Green Bay, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  100. Pecatonica River Enhancement Council Inc

    EIN 203116641 · Headquarters: Darlington, WI, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

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