| 501 | 2493 | W K Kellogg Foundation |  | 1817 | 395 | 2538 | 3879 |
| 502 | 3948 | Wilderness Medical Society | | 4740 | 1785 | 2538 | 3879 |
| 503 | 4727 | Coalition for Research in Women's Health |  | 3631 | 3087 | 2538 | 3879 |
| 504 | 7021 | Wood Hudson Cancer Research Laboratory | | 7532 | 6201 | 2538 | 3879 |
| 505 | 2425 | World Policy Institute | | 1713 | 350 | 2538 | 3879 |
| 506 | 1915 | Worldwatch Institute | | 1801 | 124 | 2538 | 3879 |
| 507 | 1531 | World Wildlife Fund | | 1073 | 39 | 2538 | 3879 |
| 508 | 7325 | University Research Alliance | | 7330 | 6750 | 2538 | 3879 |
| 509 | 6527 | Upstate Freshwater Institute | | 7775 | 5269 | 2538 | 3879 |
| 510 | 4836 | University of Pittsburgh Cancer Institute | | 6678 | 2983 | 2538 | 3879 |
| 511 | 4082 | University Health Care System Augusta | | 2861 | 2106 | 2538 | 3879 |
| 512 | 7413 | US Army Aeromedical Research Laboratory | | 5780 | 7044 | 2538 | 3879 |
| 513 | 6015 | US Army Institute of Surgical Research | | 5789 | 4788 | 2538 | 3879 |
| 514 | 6471 | US Army Medical Research Institute of Infectious Diseases | | 7233 | 5322 | 2538 | 3879 |
| 515 | 2223 | VCA Newark Animal Hospital | | 205 | 305 | 2538 | 3879 |
| 516 | 4461 | Virginia Bioinformatics Institute | | 2946 | 4044 | 2249 | 3879 |
| 517 | 4464 | University of the West Indies Seismic Research Centre |  | 5271 | 2544 | 2538 | 3879 |
| 518 | 4565 | Ocular Immunology and Uveitus Foundation | | 5188 | 2710 | 2538 | 3879 |
| 519 | 5456 | United Technologies Research Center | | 6695 | 6442 | 653 | 3879 |
| 520 | 7776 | Utah Bone & Joint Center | | 7851 | 7460 | 2538 | 3879 |
| 521 | 2852 | US Oncology | | 3410 | 1651 | 1756 | 3879 |
| 522 | 4088 | United States Naval Observatory | | 403 | 2432 | 2538 | 3879 |
| 523 | 7481 | US Army Research Institute of Environmental Medicine | | 6800 | 7074 | 2538 | 3879 |
| 524 | 2804 | US Antarctic Program | | 1860 | 626 | 2538 | 3879 |
| 525 | 1915 | UnityPoint Health (Trinity Regional Health System) | | 531 | 471 | 1980 | 3879 |
| 526 | 3788 | Versiti (BloodCenter of Wisconsin) | | 3570 | 1631 | 2538 | 3879 |
| 527 | 7930 | VA Healthcare System of Ohio, Indiana and Michigan | | 7436 | 7852 | 2538 | 3879 |
| 528 | 7956 | VA Great Lakes Health Care System VISN 12 | | 7339 | 7893 | 2538 | 3879 |
| 529 | 8015 | VA Heartland Network VISN 15 | | 7696 | 7963 | 2538 | 3879 |
| 530 | 7826 | VA Health Care Network South Central | | 7512 | 7605 | 2538 | 3879 |
| 531 | 7998 | VA Rocky Mountain Network | | 7861 | 7908 | 2538 | 3879 |
| 532 | 4068 | Vermont Institute Natural Science | | 4187 | 2014 | 2538 | 3879 |
| 533 | 6006 | Victoria General Hospital | | 6934 | 4659 | 2538 | 3879 |
| 534 | 7539 | VA Healthcare Network Upstate New York VISN 2 | | 5655 | 7231 | 2538 | 3879 |
| 535 | 5973 | Veterinary Neurological Center | | 5955 | 4718 | 2538 | 3879 |
| 536 | 7670 | VA Healthcare VISN 4 | | 6238 | 7438 | 2538 | 3879 |
| 537 | 7967 | VHA eHealth University | | 7266 | 7920 | 2538 | 3879 |
| 538 | 7893 | VA Mid-Atlantic Health Care Network VISN 6 | | 7380 | 7786 | 2538 | 3879 |
| 539 | 7869 | VA MidSouth Healthcare Network VISN 9 | | 7266 | 7737 | 2538 | 3879 |
| 540 | 7798 | VA Sunshine Healthcare Network | | 6895 | 7618 | 2538 | 3879 |
| 541 | 7454 | VA Northwest Network VISN 20 | | 5603 | 7104 | 2538 | 3879 |
| 542 | 7808 | VA Sierra Pacific Network VISN 21 | | 7380 | 7590 | 2538 | 3879 |
| 543 | 5465 | Venice Hospital | | 4154 | 4137 | 2538 | 3879 |
| 544 | 7820 | VA Midwest Health Care Network VISN 23 | | 7030 | 7645 | 2538 | 3879 |
| 545 | 1883 | Lifespan | | 1703 | 807 | 475 | 3879 |
| 546 | 7955 | Laboratorio Internacional de Investigación del Cambio Global |  | 8011 | 7724 | 2538 | 3879 |
| 547 | 6969 | Lincoln Medical and Mental Health Center | | 7155 | 6193 | 2538 | 3879 |
| 548 | 6476 | Lithuanian Research and Studies Center Chicago | | 4893 | 5573 | 2538 | 3879 |
| 549 | 2040 | Loyola Law School los Angeles | | 1267 | 605 | 1848 | 3879 |
| 550 | 724 | Library of Congress | | 9 | 5 | 2394 | 3879 |
| 551 | 6339 | University of Louisville Department of Surgery | | 6546 | 5227 | 2538 | 3879 |
| 552 | 4945 | Lawrenceville Plasma Physics Fusion | | 4402 | 3337 | 2538 | 3879 |
| 553 | 6375 | Learning Research & Development Center | | 4049 | 5466 | 2538 | 3879 |
| 554 | 7593 | USGS Leetown Science Center | | 7544 | 7185 | 2538 | 3879 |
| 555 | 3086 | Long Term Ecological Research Network | | 792 | 913 | 2538 | 3879 |
| 556 | 7179 | Lunar Research Institute | | 7472 | 6481 | 2538 | 3879 |
| 557 | 2537 | Samuel Lunenfeld Research Institute | | 3410 | 2087 | 187 | 3879 |
| 558 | 5602 | Luquillo Experimental Forest Long Term Ecological Research Network |  | 3823 | 4336 | 2538 | 3879 |
| 559 | 7418 | VA Maine Healthcare System | | 7030 | 6964 | 2538 | 3879 |
| 560 | 4534 | Marcus Institute | | 6475 | 2547 | 2538 | 3879 |
| 561 | 7215 | Centro Cientifico Tecnologico CONICET Mar del Plata |  | 5659 | 6709 | 2538 | 3879 |
| 562 | 2848 | Marine Mammal Center | | 2903 | 640 | 2538 | 3879 |
| 563 | 7330 | Marion VA Medical Center | | 6580 | 6842 | 2538 | 3879 |
| 564 | 7242 | VA Medical Center Martinsburg WV | | 6252 | 6714 | 2538 | 3879 |
| 565 | 4559 | Martin's Point Health Care | | 5103 | 2705 | 2538 | 3879 |
| 566 | 1093 | Mayo Clinic | | 72 | 10 | 2538 | 3879 |
| 567 | 6322 | Michigan Biotechnology Institute | | 7598 | 4990 | 2538 | 3879 |
| 568 | 4707 | McCrone Research Institute | | 6103 | 2872 | 2538 | 3879 |
| 569 | 3134 | Mclean Hospital | | 3119 | 871 | 2538 | 3879 |
| 570 | 3909 | Mcleod Health | | 2062 | 1910 | 2538 | 3879 |
| 571 | 7524 | Midwest Cardiovascular Research Foundation | | 6944 | 7113 | 2538 | 3879 |
| 572 | 3958 | MEDNAX Phoenix Perinatal Associates | | 2469 | 1948 | 2538 | 3879 |
| 573 | 5500 | Maine Environmental Policy Institute | | 6997 | 3857 | 2538 | 3879 |
| 574 | 3965 | Herman & Walter Samuelson Children's Hospital at Sinai | | 7157 | 1622 | 2538 | 3879 |
| 575 | 2651 | Memorial Hermann Northwest Hospital | | 960 | 544 | 2538 | 3879 |
| 576 | 4707 | Memorial Hospital Jacksonville | | 4953 | 2971 | 2538 | 3879 |
| 577 | 4452 | Memorial Health System Memorial Medical Center Springfield | | 3651 | 2646 | 2538 | 3879 |
| 578 | 7170 | Memorial Orthopaedic Surgical Group | | 7428 | 6466 | 2538 | 3879 |
| 579 | 7567 | Memphis Medical Center | | 7984 | 6908 | 2538 | 3879 |
| 580 | 7513 | Centro Regional de Investigaciones Científicas y Tecnológicas de Mendoza | | 2685 | 7727 | 2433 | 3879 |
| 581 | 4494 | Mental Health | | 4916 | 2622 | 2538 | 3879 |
| 582 | 2058 | Mercy | | 1120 | 574 | 2006 | 3879 |
| 583 | 4272 | Instituto de Meteorología de la República de Cuba |  | 5804 | 2206 | 2538 | 3879 |
| 584 | 5706 | Methodist Sports Medicine Center | | 5188 | 4406 | 2538 | 3879 |
| 585 | 5168 | Michigan Headache & Neurological Institute | | 6987 | 3397 | 2538 | 3879 |
| 586 | 6295 | Miami Hand Center | | 6045 | 5223 | 2538 | 3879 |
| 587 | 5325 | Michigan Ear Institute | | 6910 | 3630 | 2538 | 3879 |
| 588 | 3981 | Mallinckrodt Institute of Radiology | | 4468 | 4515 | 778 | 3879 |
| 589 | 6074 | Mental Illness Research Education and Clinical Centers MIRECC | | 3689 | 5066 | 2538 | 3879 |
| 590 | 6419 | Mississippi Sports Medicine and Orthopaedic Center | | 7472 | 5217 | 2538 | 3879 |
| 591 | 5801 | Michigan Molecular Institute | | 6944 | 4357 | 2538 | 3879 |
| 592 | 6240 | Molecular Sciences Institute | | 8091 | 4379 | 2538 | 3879 |
| 593 | 4450 | International Heart Institute Montana Foundation | | 5535 | 2494 | 2538 | 3879 |
| 594 | 7225 | VA Montana Healthcare System | | 7068 | 6606 | 2538 | 3879 |
| 595 | 7097 | Morgan Kalman Clinic | | 7562 | 6294 | 2538 | 3879 |
| 596 | 7340 | Mountain Quest Institute | | 8011 | 6413 | 2538 | 3879 |
| 597 | 5038 | Mountainside Hospital | | 5623 | 3361 | 2538 | 3879 |
| 598 | 2984 | Mount Washington Observatory | | 5489 | 662 | 2538 | 3879 |
| 599 | 5376 | MPI Research | | 7834 | 3447 | 2538 | 3879 |
| 600 | 5699 | Minneapolis Heart Institute | | 5940 | 4317 | 2538 | 3879 |
