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Organization	Location	Revenue	Expenses	Assets	Program	Fundr. cost	Employees	Type
Association of Universities for Research in Astronomy INC To promote excellence in astronomical RESEARCH. 86-0138043 · FY2023	Tucson, AZ	$450.4M	$447.3M	$125.9M	91%	0%	1,475	501(c)(3)
Earthscope Consortium Facilitating geophysical research and education, promoting free and open exchange of geophysical data and… 52-1362650 · FY2023	Washington, DC	$43.1M	$43.7M	$8.1M	85%	0%	162	501(c)(3)
Point Reyes Bird Observatory The organization's mission is to conserve birds, other wildlife and ecosystems through scientific research… 94-1594250 · FY2024	Petaluma, CA	$31.7M	$28.6M	$26.4M	81%	5%	143	501(c)(3)
California Association for Research in Astronomy 95-3972799 · FY2023	Kamuela, HI	$30.4M	$32.9M	$62.0M	84%	2%	160	501(c)(3)
American Astronomical Society To promote scientific research in and public understanding of astronomy and astrophysics. 21-0735173 · FY2024	Washington, DC	$21.9M	$21.7M	$25.5M	80%	0%	42	501(c)(3)
Large Binocular Telescope Corporation To construct and operate a research facility known as the LARGE BINOCULAR TELESCOPE. 86-0724677 · FY2024	Tucson, AZ	$15.2M	$22.1M	$94.6M	90%	0%	—	501(c)(3)
Lowell Observatory The mission of LOWELL OBSERVATORY is to pursue the study of astronomy, especially the study of our solar… 86-0098918 · FY2024	Flagstaff, AZ	$11.9M	$19.5M	$97.9M	78%	9%	183	501(c)(3)
Rocky Mountain Bird Observatory Our mission is to conserve birds and their habitats through an integrated approach of science, education and… 84-1079882 · FY2024	Brighton, CO	$10.1M	$9.2M	$7.7M	87%	2%	168	501(c)(3)
Canada France Hawaii Telescope Corporation Operate 3.6 meter astronomical TELESCOPE to further the knowledge and understanding of the universe through… 23-7438736 · FY2025	Kamuela, HI	$9.1M	$10.0M	$12.5M	84%	0%	46	501(c)(3)
Astrophysical Research Consortium Astrophysical Research Consortium was established to design, build and operate a variety of sizes and shapes… 91-1265806 · FY2024	Seattle, WA	$5.2M	$11.2M	$34.7M	96%	0%	60	501(c)(3)
Soar Consortium INC Scientific research in astronomy. 86-0944542 · FY2023	Tucson, AZ	$3.4M	$4.4M	$22.0M	90%	0%	—	501(c)(3)
Aspen Center for Physics The CENTER is a scientific organization which promotes organized research in PHYSICS, astrophysics, and… 84-6059504 · FY2024	Aspen, CO	$3.4M	$4.1M	$8.5M	91%	0%	5	501(c)(3)
Mount Washington Observatory Scientific research for government education and industry. 02-0225135 · FY2024	North Conway, NH	$2.7M	$2.4M	$12.4M	71%	21%	31	501(c)(3)
Northeast Radio Observatory Corporation NORTHEAST RADIO OBSERVATORY CORPORATION is a consortium of educational and research institutions whose… 04-6156432 · FY2023	Cambridge, MA	$2.7M	$2.7M	$157.3K	100%	0%	—	501(c)(3)
Astronomical Society of the Pacific Improving science literacy through education and public outreach programs advancing the public understanding… 94-0294860 · FY2023	San Francisco, CA	$2.4M	$3.0M	$4.9M	74%	4%	16	501(c)(3)
Vatican Observatory Foundation a Nonprofit Corporation The Vatican Observatory Foundation brings together scientists, philanthropists and the Catholic Church to… 86-0559994 · FY2023	Tucson, AZ	$1.5M	$1.0M	$4.8M	60%	23%	3	501(c)(3)
Mount Wilson Institute The Mount Wilson Institute provides access to the facilities of Mount Wilson observatory to visiting… 77-0132297 · FY2024	Pasadena, CA	$1.2M	$946.4K	$4.3M	84%	0%	12	501(c)(3)
American Association of Variable Star Observers The aavso, through its members and the broader astronomical community, conducts astronomical research, does… 04-2164402 · FY2023	Cambridge, MA	$1.1M	$1.2M	$20.3M	61%	5%	8	501(c)(3)
Mdm Observatory Consortium INC To provide opportunities for education and research in the fields of astronomy and astrophysics. 02-0513199 · FY2024	Hanover, NH	$577.7K	$465.9K	$1.7M	100%	0%	—	501(c)(3)
Monterey Institute for Research in Astronomy 1) Conduct astronomical research.(2) Encourage the advancement of knowledge concerning astronomy by educating… 23-7128629 · FY2024	Marina, CA	$397.1K	$461.5K	$5.4M	61%	0%	8	501(c)(3)
Association of Lunar and Planetary Observers Our organization supports education, outreach, and research in amateur astronomy. Our mission is to… 94-3123439 · FY2025	Simi Valley, CA	$221.0K	$47.1K	$1.6M	68%	0%	—	501(c)(3)
Tucson Amateur Astronomy Association Incorporated The Association shall be an educational, service, scientific, and technical organization devoted to the study… 74-2401304 · FY2024	Tucson, AZ	$213.4K	$100.6K	$1.7M	92%	0%	—	501(c)(3)
Valley of the Moon Observatory Association Provides free or low cost access to an astronomical OBSERVATORY and educational programs about science and… 47-0877393 · FY2024	Glen Ellen, CA	$210.1K	$193.6K	$339.8K	68%	0%	2	501(c)(3)
Rocky Mountain Association of Geologists Promote interest in geology and allied sciences 84-6036048 · FY2024	Denver, CO	$184.4K	$209.1K	$1.9M	32%	12%	3	501(c)(3)
Project Night Sky To encourage and promote the study and practice of astronomy and contribute to scientific obervations 83-0931665 · FY2024	Huntsville, AL	$150.0K	$193.7K	$1.1M	100%	0%	3	501(c)(3)
Battle Point Astronomical Association 91-1619085 · FY2024	Bainbridge Island, WA	$145.7K	—	$328.5K	—	—	—	501(c)(3)
World Ocean Observatory 46-5693943 · FY2024	Sedgwick, ME	$143.7K	—	$4.4K	—	—	—	501(c)(3)
Springfield Telescope Makers INC The organization operates as an educational institution, formed to archive, teach and further impart… 22-2582956 · FY2025	Springfield, VT	$134.7K	$84.9K	$736.8K	51%	0%	—	501(c)(3)
Tmt Observatory Corporation 20-0988966 · FY2023	Monrovia, CA	$132.1K	$61.2K	$3.3M	0%	0%	5	501(c)(3)
Carlton Observatory 82-4957052 · FY2024	Carlton, OR	$117.4K	—	$273.8K	—	—	—	501(c)(3)
Atlanta Astronomy Club INC 58-6047785 · FY2023	Atlanta, GA	$116.1K	—	$0	—	—	—	501(c)(3)
Link Observatory and Space Science Center Corporation 45-5369783 · FY2022	Westfield, IN	$105.4K	—	$0	—	—	—	501(c)(3)
Stellar Vista Observatory 83-3526645 · FY2024	Kanab, UT	$98.9K	—	$155.2K	—	—	—	501(c)(3)
Amateur Astronomers Association 13-6089946 · FY2024	New York, NY	$98.2K	—	$431.3K	—	—	—	501(c)(3)
The Cincinnati Astronomical Society The Cincinnati Astronomical Society (CAS), founded in 1911, encourages and supports amateur astronomers and… 23-7091625 · FY2023	Cleves, OH	$90.6K	$37.6K	$671.4K	92%	0%	—	501(c)(3)
Consortium of Organizations for Strong Motion Observation Systems DBA Cosmos 68-0430266 · FY2024	San Francisco, CA	$73.5K	—	$49.3K	—	—	—	501(c)(3)
San Diego Astronomy Association 51-0183640 · FY2023	San Diego, CA	$70.2K	—	$250.4K	—	—	—	501(c)(3)
Institute of Cosmic Sciences Incorporated 99-3195526 · FY2025	San Jose, CA	$56.4K	—	$51.1K	—	—	—	501(c)(3)
Planets Telescope Foundation 47-4027864 · FY2024	Kula, HI	$0	—	$349.0K	—	—	—	501(c)(3)

2,046,138

nonprofits

212,946

funders

12,515,252

grants

22,549,931

directors

214,365

service providers

549,896,012

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Public data from IRS Form 990 e-file & Business Master File. A 990 shows reported financial activity, not measured program outcomes. Assets are from the IRS BMF and may lag the latest filing; fundraising cost is fundraising expenses as a share of total expenses. · philanthropy.org