| 601 | 542 | Mathematica Policy Research |  | 1494 | 637 | 830 | 1454 |
| 602 | 2596 | Mathematical Sciences Research Institute | | 610 | 523 | 2538 | 3879 |
| 603 | 1093 | Mayo Clinic | | 72 | 10 | 2538 | 3879 |
| 604 | 4707 | McCrone Research Institute | | 6103 | 2872 | 2538 | 3879 |
| 605 | 450 | McGill University Health Centre |  | 842 | 866 | 2538 | 108 |
| 606 | 5178 | Mclaughlin Centre for Population Health Risk Assessment | | 6676 | 5691 | 2538 | 3316 |
| 607 | 3134 | Mclean Hospital | | 3119 | 871 | 2538 | 3879 |
| 608 | 3909 | Mcleod Health | | 2062 | 1910 | 2538 | 3879 |
| 609 | 1550 | Medical City Hospital | | 1508 | 2209 | 2538 | 1490 |
| 610 | 3958 | MEDNAX Phoenix Perinatal Associates | | 2469 | 1948 | 2538 | 3879 |
| 611 | 840 | Medstar Health Research Institute (MedStar Washington Hospital Center) | | 579 | 752 | 2538 | 930 |
| 612 | 4452 | Memorial Health System Memorial Medical Center Springfield | | 3651 | 2646 | 2538 | 3879 |
| 613 | 2651 | Memorial Hermann Northwest Hospital | | 960 | 544 | 2538 | 3879 |
| 614 | 4707 | Memorial Hospital Jacksonville | | 4953 | 2971 | 2538 | 3879 |
| 615 | 7170 | Memorial Orthopaedic Surgical Group | | 7428 | 6466 | 2538 | 3879 |
| 616 | 7567 | Memphis Medical Center | | 7984 | 6908 | 2538 | 3879 |
| 617 | 3073 | Memphis VA Medical Center | | 6768 | 6347 | 2538 | 1153 |
| 618 | 4494 | Mental Health | | 4916 | 2622 | 2538 | 3879 |
| 619 | 6074 | Mental Illness Research Education and Clinical Centers MIRECC | | 3689 | 5066 | 2538 | 3879 |
| 620 | 2058 | Mercy | | 1120 | 574 | 2006 | 3879 |
| 621 | 185 | Methodist Hospital Houston | | 764 | 562 | 178 | 214 |
| 622 | 5706 | Methodist Sports Medicine Center | | 5188 | 4406 | 2538 | 3879 |
| 623 | 493 | MetroHealth System Cleveland | | 3010 | 872 | 906 | 804 |
| 624 | 6295 | Miami Hand Center | | 6045 | 5223 | 2538 | 3879 |
| 625 | 6512 | Miami Heart Research Institute | | 6983 | 5427 | 2538 | 3879 |
| 626 | 3212 | Miami VA Healthcare System | | 6726 | 6424 | 2538 | 1288 |
| 627 | 2171 | Michael E. DeBakey VA Medical Center | | 6414 | 5978 | 2538 | 446 |
| 628 | 6322 | Michigan Biotechnology Institute | | 7598 | 4990 | 2538 | 3879 |
| 629 | 5325 | Michigan Ear Institute | | 6910 | 3630 | 2538 | 3879 |
| 630 | 5168 | Michigan Headache & Neurological Institute | | 6987 | 3397 | 2538 | 3879 |
| 631 | 5801 | Michigan Molecular Institute | | 6944 | 4357 | 2538 | 3879 |
| 632 | 7524 | Midwest Cardiovascular Research Foundation | | 6944 | 7113 | 2538 | 3879 |
| 633 | 752 | Milton S. Hershey Medical Center Penn State Health | | 2541 | 1397 | 2538 | 222 |
| 634 | 5699 | Minneapolis Heart Institute | | 5940 | 4317 | 2538 | 3879 |
| 635 | 1612 | Minneapolis Heart Institute Foundation | | 4605 | 2944 | 2538 | 1061 |
| 636 | 2620 | Minneapolis Medical Research Foundation | | 7193 | 5215 | 2538 | 1351 |
| 637 | 6419 | Mississippi Sports Medicine and Orthopaedic Center | | 7472 | 5217 | 2538 | 3879 |
| 638 | 659 | Missouri Botanical Garden | | 953 | 233 | 2538 | 1218 |
| 639 | 486 | Mitsubishi Electric Research Laboratories | | 1894 | 886 | 433 | 981 |
| 640 | 6240 | Molecular Sciences Institute | | 8091 | 4379 | 2538 | 3879 |
| 641 | 789 | Monell Chemical Senses Center | | 4651 | 934 | 1208 | 1572 |
| 642 | 123 | Montefiore Medical Center | | 620 | 668 | 217 | 60 |
| 643 | 380 | Monterey Bay Aquarium Research Institute | | 1735 | 396 | 423 | 1113 |
| 644 | 7097 | Morgan Kalman Clinic | | 7562 | 6294 | 2538 | 3879 |
| 645 | 2741 | Moss Landing Marine Laboratories | | 1440 | 4994 | 1350 | 3034 |
| 646 | 1255 | Mote Marine Laboratory | | 2425 | 540 | 1693 | 3140 |
| 647 | 3528 | Mount Auburn Hospital | | 4122 | 1988 | 2538 | 3660 |
| 648 | 1363 | Mount Desert Island Biological Laboratory | | 443 | 1551 | 1978 | 2460 |
| 649 | 36 | Mount Sinai Health System New York City | | 709 | 164 | 194 | 23 |
| 650 | 1467 | Mount Sinai Medical Center | | 2985 | 1450 | 2346 | 2313 |
| 651 | 2984 | Mount Washington Observatory | | 5489 | 662 | 2538 | 3879 |
| 652 | 2963 | Mount Wilson Observatory | | 7193 | 969 | 2538 | 3660 |
| 653 | 7340 | Mountain Quest Institute | | 8011 | 6413 | 2538 | 3879 |
| 654 | 5038 | Mountainside Hospital | | 5623 | 3361 | 2538 | 3879 |
| 655 | 5376 | MPI Research | | 7834 | 3447 | 2538 | 3879 |
| 656 | 3884 | MRI Global (Midwest Research Institute) | | 6748 | 3335 | 1809 | 3879 |
| 657 | 3942 | MSFC Science Research Office (National Space Science & Technology Center) | | 7518 | 1539 | 2538 | 3879 |
| 658 | 5059 | NASA Advanced Supercomputing Division | | 2328 | 3642 | 2538 | 3879 |
| 659 | 1266 | NASA Goddard Institute for Space Studies | | 1301 | 2459 | 2538 | 667 |
| 660 | 3466 | NASA Infrared Telescope Facility | | 2004 | 1299 | 2538 | 3879 |
| 661 | 4514 | NASA Langley Research Center | | 594 | 3038 | 2538 | 3879 |
| 662 | 4361 | NASA Marshall Space Flight Center | | 598 | 2810 | 2538 | 3879 |
| 663 | 6341 | NASA Stennis Space Center | | 5679 | 5303 | 2538 | 3879 |
| 664 | 6801 | Nashville Hip Institute | | 7191 | 5881 | 2538 | 3879 |
| 665 | 7503 | Nashville Neuroscience Group | | 7785 | 6958 | 2538 | 3879 |
| 666 | 1453 | National Academies | | 693 | 176 | 1641 | 3879 |
| 667 | 3200 | National Academy for State Health Policy | | 2614 | 944 | 2538 | 3879 |
| 668 | 1709 | National Academy of Engineering | | 937 | 380 | 2538 | 3316 |
| 669 | 1534 | National Academy of Sciences | | 1834 | 230 | 2538 | 3316 |
| 670 | 3207 | National Academy of Social Insurance | | 3056 | 932 | 2538 | 3879 |
| 671 | 2 | National Aeronautics and Space Administration | | 7 | 3 | 19 | 18 |
| 672 | 1231 | National Audubon Society | | 391 | 71 | 1883 | 3879 |
| 673 | 57 | National Bureau of Economic Research | | 119 | 27 | 1700 | 181 |
| 674 | 32 | National Cancer Institute | | 198 | 20 | 2117 | 45 |
| 675 | 2764 | National Capital Poison Center | | 5531 | 499 | 2538 | 3879 |
| 676 | 502 | National Center for Atmospheric Research | | 5716 | 708 | 2538 | 148 |
| 677 | 76 | National Center for Biotechnology Information | | 2 | 59 | 208 | 574 |
| 678 | 823 | National Center for Complementary and Integrative Health | | 2528 | 100 | 2538 | 2290 |
| 679 | 3116 | National Center for Ecological Analysis and Synthesis | | 1484 | 2718 | 1102 | 3879 |
| 680 | 4269 | National Center for Education in Maternal and Child Health | | 3870 | 2358 | 2538 | 3879 |
| 681 | 7405 | National Center for Ethics in Health Care | | 5336 | 7056 | 2538 | 3879 |
| 682 | 1809 | National Center for Genome Resources | | 6456 | 1711 | 2090 | 2867 |
| 683 | 3701 | National Center for Manufacturing Sciences | | 3698 | 1505 | 2538 | 3879 |
| 684 | 3774 | National Center for Posttraumatic Stress Disorder | | 3434 | 1626 | 2538 | 3879 |
| 685 | 7744 | National Center for Rehabilitative Auditory Research | | 6485 | 7558 | 2538 | 3879 |
| 686 | 2355 | National Center for Supercomputing Applications | | 1034 | 2048 | 2538 | 2919 |
| 687 | 3985 | National Center for Voice and Speech | | 4532 | 1854 | 2538 | 3879 |
| 688 | 4996 | National Center on Minority Health and Health Disparities | | 4514 | 3393 | 2538 | 3879 |
| 689 | 4074 | National Centers for Environmental Prediction | | 208 | 3423 | 2538 | 3660 |
| 690 | 2825 | National Child Traumatic Stress Network | | 6079 | 904 | 2538 | 3660 |
| 691 | 3125 | National Childhood Cancer Foundation | | 3486 | 850 | 2538 | 3879 |
| 692 | 1457 | National Development Research Institute Inc | | 6635 | 3329 | 671 | 1906 |
| 693 | 2792 | National Energy Research Scientific Computing Center | | 1069 | 649 | 2538 | 3879 |
| 694 | 498 | National Energy Technology Laboratory | | 590 | 1457 | 285 | 689 |
| 695 | 1593 | National Evolutionary Synthesis Center | | 4029 | 1578 | 2538 | 1906 |
| 696 | 246 | National Eye Institute | | 2673 | 180 | 1195 | 686 |
| 697 | 2318 | National Geospatial-Intelligence Agency (Defense Mapping Agency) | | 1259 | 301 | 2538 | 3879 |
| 698 | 189 | National Heart Lung and Blood Institute | | 1535 | 799 | 267 | 120 |
| 699 | 841 | National High Magnetic Field Laboratory MagLab | | 2767 | 1100 | 2538 | 513 |
| 700 | 298 | National Human Genome Research Institute | | 1735 | 110 | 2538 | 349 |
