| Organizations performing similar types of work |
| Id | Name | Address | State | Established | Total Income |
|---|
| 1 | Environmental Defense Fund Incorporated | 257 Park Ave So 16fl, New York, NY 10010-7304 | NY | 1969-09 | $125,085,898 |
| 2 | National Parks Conservation Association | 777 6th St Nw Ste 700, Washington, DC 20001-4835 | DC | 1959-02 | $52,862,018 |
| 3 | Islandwood | 4450 Blakely Ave Ne, Bainbridge Is, WA 98110-2257 | WA | 1999-10 | $32,395,354 |
| 4 | National Outdoor Leadership School | 284 Lincoln St, Lander, WY 82520-2848 | WY | 1966-01 | $31,207,988 |
| 5 | Appalachian Mountain Club | 5 Joy St, Boston, MA 02108-1403 | MA | 1934-08 | $23,144,610 |
| 6 | Chippewa Nature Center Inc | 400 S Badour Rd, Midland, MI 48640-8661 | MI | 1966-08 | $13,154,066 |
| 7 | Cincinnati Nature Center Association | 4949 Tealtown Rd, Milford, OH 45150-9737 | OH | 1965-12 | $12,237,791 |
| 8 | Gilroy Gardens Family Theme Park | 3050 Hecker Pass Hwy, Gilroy, CA 95020-9411 | CA | 1998-03 | $8,937,351 |
| 9 | Delaware Nature Society Inc | PO BOX 700, Hockessin, DE 19707-0700 | DE | 1965-01 | $7,968,843 |
| 10 | Shelburne Farms | Harbor Road, Shelburne, VT 05482 | VT | 1973-09 | $7,360,046 |
| 11 | Outward Bound Inc | 100 Mystery Pt, Garrison, NY 10524-3058 | NY | 1964-10 | $5,909,743 |
| 12 | New York City Outward Bound Center Inc | 2946 Northern Blvd, Long Is City, NY 11101-2813 | NY | 1989-10 | $5,164,089 |
| 13 | North Cascades Institute | 810 State Route 20, Sedro Woolley, WA 98284-1263 | WA | 1986-12 | $3,452,046 |
| 14 | Wolf Ridge Environmental Learning Center | 6282 Cranberry Rd, Finland, MN 55603-9727 | MN | 1976-05 | $3,417,393 |
| 15 | Squam Lakes Natural Science Center | PO BOX 173, Holderness, NH 03245-0173 | NH | 1967-07 | $3,128,499 |
| 16 | The Trust For Hidden Villa | 26870 Moody Rd, Los Altos, CA 94022-4209 | CA | 1960-04 | $2,669,705 |
| 17 | Colorado Mountain Club | 710 10th St Ste 200, Golden, CO 80401-5843 | CO | 1994-09 | $2,285,685 |
| 18 | Red Rock Canyon Interpretive Association | 6755 W Charleston Blvd, Las Vegas, NV 89146-1051 | NV | | $2,270,177 |
| 19 | Stony Brook-Millstone Watersheds Assn | 31 Titus Mill Rd, Pennington, NJ 08534-4303 | NJ | 1953-05 | $2,192,470 |
| 20 | The Schuylkill Center For Enviornmental Education | 8480 Hagys Mill Rd, Philadelphia, PA 19128-1998 | PA | 1966-06 | $2,092,729 |
| 21 | Forest Park Foundation | 5823 N Forest Park Drive, Peoria, IL 61614-3514 | IL | 1952-01 | $1,431,683 |
| 22 | Hawaii Nature Center Inc | 2131 Makiki Heights Dr, Honolulu, HI 96822-2520 | HI | 1981-12 | $1,114,477 |
| 23 | Ned Smith Center For Nature And Art | PO BOX 33, Millersburg, PA 17061-0033 | PA | 1994-07 | $1,105,389 |
| 24 | Foothills Equestrian Nature Center Inc | 3381 Hunting Country Rd, Tryon, NC 28782-6669 | NC | 1984-12 | $903,530 |
| 25 | Partnership For The Sounds Inc | PO BOX 55, Columbia, NC 27925-0055 | NC | 1994-06 | $894,324 |
| 26 | Darien Nature Center Inc | PO BOX 1603, Darien, CT 06820-1603 | CT | 1981-12 | $786,938 |
| 27 | Alley Pond Environmental Center Inc | 22806 Northern Blvd, Douglaston, NY 11362-1068 | NY | 1977-08 | $750,227 |
| 28 | Beartooth Nature Center | 115 E 2nd St, Red Lodge, MT 59068 | MT | 1986-03 | $379,505 |
| 29 | Bitterroot Ecological Awareness Resources Inc | 310 N 4th St, Hamilton, MT 59840-2412 | MT | 1998-12 | $113,664 |
| 30 | Montana Energy Education Council Inc | 17 Hitching Post Rd, Bozeman, MT 59715 | MT | 1986-01 | $0 |
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