| 1001 | 237 | Marine Biological Laboratory |  | 964 | 307 | 254 | 690 |
| 1002 | 2848 | Marine Mammal Center | | 2903 | 640 | 2538 | 3879 |
| 1003 | 5418 | Marine Spill Response Corporation | | 6260 | 3840 | 2538 | 3879 |
| 1004 | 7330 | Marion VA Medical Center | | 6580 | 6842 | 2538 | 3879 |
| 1005 | 1481 | Marlborough Hospital | | 2221 | 1268 | 2538 | 1960 |
| 1006 | 536 | Marshfield Clinic | | 1933 | 777 | 1582 | 930 |
| 1007 | 4559 | Martin's Point Health Care | | 5103 | 2705 | 2538 | 3879 |
| 1008 | 3171 | Mason Research Institute | | 4122 | 2382 | 1484 | 3879 |
| 1009 | 3291 | Masonic Medical Research Laboratory | | 7292 | 3841 | 2538 | 2782 |
| 1010 | 714 | Massachusetts Eye and Ear Infirmary | | 2895 | 834 | 2538 | 408 |
| 1011 | 87 | Massachusetts General Hospital | | 539 | 106 | 2538 | 10 |
| 1012 | 5171 | Materials Research Science & Engineering Centers | | 4140 | 3658 | 2538 | 3879 |
| 1013 | 542 | Mathematica Policy Research | | 1494 | 637 | 830 | 1454 |
| 1014 | 2596 | Mathematical Sciences Research Institute | | 610 | 523 | 2538 | 3879 |
| 1015 | 1093 | Mayo Clinic | | 72 | 10 | 2538 | 3879 |
| 1016 | 4707 | McCrone Research Institute | | 6103 | 2872 | 2538 | 3879 |
| 1017 | 450 | McGill University Health Centre |  | 842 | 866 | 2538 | 108 |
| 1018 | 5178 | Mclaughlin Centre for Population Health Risk Assessment | | 6676 | 5691 | 2538 | 3316 |
| 1019 | 3134 | Mclean Hospital | | 3119 | 871 | 2538 | 3879 |
| 1020 | 3909 | Mcleod Health | | 2062 | 1910 | 2538 | 3879 |
| 1021 | 1550 | Medical City Hospital | | 1508 | 2209 | 2538 | 1490 |
| 1022 | 3958 | MEDNAX Phoenix Perinatal Associates | | 2469 | 1948 | 2538 | 3879 |
| 1023 | 840 | Medstar Health Research Institute (MedStar Washington Hospital Center) | | 579 | 752 | 2538 | 930 |
| 1024 | 4452 | Memorial Health System Memorial Medical Center Springfield | | 3651 | 2646 | 2538 | 3879 |
| 1025 | 2651 | Memorial Hermann Northwest Hospital | | 960 | 544 | 2538 | 3879 |
| 1026 | 4707 | Memorial Hospital Jacksonville | | 4953 | 2971 | 2538 | 3879 |
| 1027 | 7170 | Memorial Orthopaedic Surgical Group | | 7428 | 6466 | 2538 | 3879 |
| 1028 | 7567 | Memphis Medical Center | | 7984 | 6908 | 2538 | 3879 |
| 1029 | 3073 | Memphis VA Medical Center | | 6768 | 6347 | 2538 | 1153 |
| 1030 | 4494 | Mental Health | | 4916 | 2622 | 2538 | 3879 |
| 1031 | 6074 | Mental Illness Research Education and Clinical Centers MIRECC | | 3689 | 5066 | 2538 | 3879 |
| 1032 | 2058 | Mercy | | 1120 | 574 | 2006 | 3879 |
| 1033 | 185 | Methodist Hospital Houston | | 764 | 562 | 178 | 214 |
| 1034 | 5706 | Methodist Sports Medicine Center | | 5188 | 4406 | 2538 | 3879 |
| 1035 | 493 | MetroHealth System Cleveland | | 3010 | 872 | 906 | 804 |
| 1036 | 6295 | Miami Hand Center | | 6045 | 5223 | 2538 | 3879 |
| 1037 | 6512 | Miami Heart Research Institute | | 6983 | 5427 | 2538 | 3879 |
| 1038 | 3212 | Miami VA Healthcare System | | 6726 | 6424 | 2538 | 1288 |
| 1039 | 2171 | Michael E. DeBakey VA Medical Center | | 6414 | 5978 | 2538 | 446 |
| 1040 | 6322 | Michigan Biotechnology Institute | | 7598 | 4990 | 2538 | 3879 |
| 1041 | 5325 | Michigan Ear Institute | | 6910 | 3630 | 2538 | 3879 |
| 1042 | 5168 | Michigan Headache & Neurological Institute | | 6987 | 3397 | 2538 | 3879 |
| 1043 | 5801 | Michigan Molecular Institute | | 6944 | 4357 | 2538 | 3879 |
| 1044 | 7524 | Midwest Cardiovascular Research Foundation | | 6944 | 7113 | 2538 | 3879 |
| 1045 | 752 | Milton S. Hershey Medical Center Penn State Health | | 2541 | 1397 | 2538 | 222 |
| 1046 | 5699 | Minneapolis Heart Institute | | 5940 | 4317 | 2538 | 3879 |
| 1047 | 1612 | Minneapolis Heart Institute Foundation | | 4605 | 2944 | 2538 | 1061 |
| 1048 | 2620 | Minneapolis Medical Research Foundation | | 7193 | 5215 | 2538 | 1351 |
| 1049 | 6419 | Mississippi Sports Medicine and Orthopaedic Center | | 7472 | 5217 | 2538 | 3879 |
| 1050 | 659 | Missouri Botanical Garden | | 953 | 233 | 2538 | 1218 |
| 1051 | 486 | Mitsubishi Electric Research Laboratories | | 1894 | 886 | 433 | 981 |
| 1052 | 6240 | Molecular Sciences Institute | | 8091 | 4379 | 2538 | 3879 |
| 1053 | 789 | Monell Chemical Senses Center | | 4651 | 934 | 1208 | 1572 |
| 1054 | 123 | Montefiore Medical Center | | 620 | 668 | 217 | 60 |
| 1055 | 380 | Monterey Bay Aquarium Research Institute | | 1735 | 396 | 423 | 1113 |
| 1056 | 7097 | Morgan Kalman Clinic | | 7562 | 6294 | 2538 | 3879 |
| 1057 | 2741 | Moss Landing Marine Laboratories | | 1440 | 4994 | 1350 | 3034 |
| 1058 | 1255 | Mote Marine Laboratory | | 2425 | 540 | 1693 | 3140 |
| 1059 | 3528 | Mount Auburn Hospital | | 4122 | 1988 | 2538 | 3660 |
| 1060 | 1363 | Mount Desert Island Biological Laboratory | | 443 | 1551 | 1978 | 2460 |
| 1061 | 36 | Mount Sinai Health System New York City | | 709 | 164 | 194 | 23 |
| 1062 | 1467 | Mount Sinai Medical Center | | 2985 | 1450 | 2346 | 2313 |
| 1063 | 2984 | Mount Washington Observatory | | 5489 | 662 | 2538 | 3879 |
| 1064 | 2963 | Mount Wilson Observatory | | 7193 | 969 | 2538 | 3660 |
| 1065 | 7340 | Mountain Quest Institute | | 8011 | 6413 | 2538 | 3879 |
| 1066 | 5038 | Mountainside Hospital | | 5623 | 3361 | 2538 | 3879 |
| 1067 | 5376 | MPI Research | | 7834 | 3447 | 2538 | 3879 |
| 1068 | 3884 | MRI Global (Midwest Research Institute) | | 6748 | 3335 | 1809 | 3879 |
| 1069 | 3942 | MSFC Science Research Office (National Space Science & Technology Center) | | 7518 | 1539 | 2538 | 3879 |
| 1070 | 2533 | Museo Argentino de Ciencias Naturales Bernardino Rivadavia |  | 5701 | 4478 | 2538 | 1753 |
| 1071 | 7225 | Museo de Antropologia | | 6417 | 6671 | 2538 | 3879 |
| 1072 | 1880 | Museo Paleontológico Egidio Feruglio | | 5773 | 2442 | 2219 | 2510 |
| 1073 | 835 | Museu Paraense Emilio Goeldi |  | 1917 | 1467 | 1097 | 1397 |
| 1074 | 5059 | NASA Advanced Supercomputing Division | | 2328 | 3642 | 2538 | 3879 |
| 1075 | 1266 | NASA Goddard Institute for Space Studies | | 1301 | 2459 | 2538 | 667 |
| 1076 | 3466 | NASA Infrared Telescope Facility | | 2004 | 1299 | 2538 | 3879 |
| 1077 | 4514 | NASA Langley Research Center | | 594 | 3038 | 2538 | 3879 |
| 1078 | 4361 | NASA Marshall Space Flight Center | | 598 | 2810 | 2538 | 3879 |
| 1079 | 6341 | NASA Stennis Space Center | | 5679 | 5303 | 2538 | 3879 |
| 1080 | 6801 | Nashville Hip Institute | | 7191 | 5881 | 2538 | 3879 |
| 1081 | 7503 | Nashville Neuroscience Group | | 7785 | 6958 | 2538 | 3879 |
| 1082 | 1453 | National Academies | | 693 | 176 | 1641 | 3879 |
| 1083 | 3200 | National Academy for State Health Policy | | 2614 | 944 | 2538 | 3879 |
| 1084 | 1709 | National Academy of Engineering | | 937 | 380 | 2538 | 3316 |
| 1085 | 1534 | National Academy of Sciences | | 1834 | 230 | 2538 | 3316 |
| 1086 | 3207 | National Academy of Social Insurance | | 3056 | 932 | 2538 | 3879 |
| 1087 | 2 | National Aeronautics and Space Administration | | 7 | 3 | 19 | 18 |
| 1088 | 1231 | National Audubon Society | | 391 | 71 | 1883 | 3879 |
| 1089 | 57 | National Bureau of Economic Research | | 119 | 27 | 1700 | 181 |
| 1090 | 32 | National Cancer Institute | | 198 | 20 | 2117 | 45 |
| 1091 | 2764 | National Capital Poison Center | | 5531 | 499 | 2538 | 3879 |
| 1092 | 502 | National Center for Atmospheric Research | | 5716 | 708 | 2538 | 148 |
| 1093 | 76 | National Center for Biotechnology Information | | 2 | 59 | 208 | 574 |
| 1094 | 823 | National Center for Complementary and Integrative Health | | 2528 | 100 | 2538 | 2290 |
| 1095 | 3116 | National Center for Ecological Analysis and Synthesis | | 1484 | 2718 | 1102 | 3879 |
| 1096 | 4269 | National Center for Education in Maternal and Child Health | | 3870 | 2358 | 2538 | 3879 |
| 1097 | 7405 | National Center for Ethics in Health Care | | 5336 | 7056 | 2538 | 3879 |
| 1098 | 1809 | National Center for Genome Resources | | 6456 | 1711 | 2090 | 2867 |
| 1099 | 3701 | National Center for Manufacturing Sciences | | 3698 | 1505 | 2538 | 3879 |
| 1100 | 3774 | National Center for Posttraumatic Stress Disorder | | 3434 | 1626 | 2538 | 3879 |
