| 401 | 1799 | Radiation Therapy Oncology Group |  | 3525 | 1818 | 2538 | 2104 |
| 402 | 4525 | Queen's Medical Center Honolulu Hawaii | | 6809 | 2486 | 2538 | 3879 |
| 403 | 7536 | Quality Enhancement Research Initiative | | 5460 | 7237 | 2538 | 3879 |
| 404 | 1268 | Public Health Institute | | 3152 | 1112 | 2538 | 1508 |
| 405 | 1360 | Providence Saint John's Health Center | | 42 | 246 | 947 | 3879 |
| 406 | 6332 | Providence Medical Group (South Carolina Heart Center) | | 6832 | 5185 | 2538 | 3879 |
| 407 | 7697 | Proteogenomics Research Institute for Systems Medicine | | 7904 | 7270 | 2538 | 3879 |
| 408 | 7076 | Prosthetics Research Study | | 7389 | 6307 | 2538 | 3879 |
| 409 | 6981 | Prosthetics and Sensory Aids Service | | 7030 | 6230 | 2538 | 3879 |
| 410 | 3046 | Property and Environment Research Center | | 3062 | 790 | 2538 | 3879 |
| 411 | 331 | Princeton Plasma Physics Laboratory | | 815 | 504 | 286 | 841 |
| 412 | 3562 | Prince William Sound Science Center | | 2923 | 3706 | 2063 | 3660 |
| 413 | 3314 | Prevention Research Center | | 6180 | 3868 | 2538 | 2867 |
| 414 | 6888 | Presbyterian Ear Institute | | 7617 | 5950 | 2538 | 3879 |
| 415 | 6346 | Premier Bone & Joint Centers (Gem City Bone and Joint Clinic) | | 5964 | 5281 | 2538 | 3879 |
| 416 | 4161 | Powder Coating Institute | | 5175 | 2067 | 2538 | 3879 |
| 417 | 3830 | Potomac Institute for Policy Studies | | 3185 | 1728 | 2538 | 3879 |
| 418 | 6447 | Postgraduate Center for Mental Health | | 7580 | 5230 | 2538 | 3879 |
| 419 | 545 | Population Council | | 2064 | 518 | 1201 | 1490 |
| 420 | 2669 | Point Blue (Point Reyes Bird Observatory) | | 3605 | 1544 | 1434 | 3879 |
| 421 | 6459 | Plasma Proteome Institute | | 6651 | 6197 | 2538 | 3660 |
| 422 | 6050 | Plano Orthopedic and Sports Medicine Center | | 5859 | 4843 | 2538 | 3879 |
| 423 | 409 | Planetary Science Institute | | 1935 | 577 | 626 | 911 |
| 424 | 2603 | Pittsburgh Supercomputing Center | | 2196 | 465 | 2538 | 3879 |
| 425 | 5399 | Pittsburgh Mercy Health System | | 7843 | 3471 | 2538 | 3879 |
| 426 | 4670 | Pinchot Institute for Conservation | | 4459 | 2946 | 2538 | 3879 |
| 427 | 3716 | Phoenix VA Health Care System | | 6194 | 6269 | 2538 | 2039 |
| 428 | 7563 | Phoenix Heart Center | | 8091 | 6807 | 2538 | 3879 |
| 429 | 2529 | Philadelphia VA Medical Center | | 6427 | 6688 | 2538 | 467 |
| 430 | 5276 | Philadelphia Hand to Shoulder Center | | 7212 | 5078 | 2538 | 3509 |
| 431 | 1340 | Peterson Institute for International Economics | | 1182 | 196 | 524 | 3879 |
| 432 | 5217 | Perry Institute for Marine Science | | 6273 | 4562 | 2538 | 3660 |
| 433 | 201 | Perimeter Institute for Theoretical Physics |  | 688 | 521 | 349 | 260 |
| 434 | 355 | Pennington Biomedical Research Center | | 2295 | 948 | 245 | 448 |
| 435 | 7292 | Pelosi Medical Center | | 7468 | 6675 | 2538 | 3879 |
| 436 | 4478 | Pediatrix Medical Group | | 2679 | 2772 | 2538 | 3879 |
| 437 | 5803 | Peachtree Orthopaedic Clinic | | 7041 | 4339 | 2538 | 3879 |
| 438 | 2900 | PeaceHealth Southwest Medical Center (Southwest Washington Medical Center) | | 1077 | 745 | 2538 | 3879 |
| 439 | 5497 | Patuxent Wildlife Research Center | | 3468 | 4214 | 2538 | 3879 |
| 440 | 5620 | Partners HealthCare Personalized Medicine Genetics and Genomics | | 6722 | 4099 | 2538 | 3879 |
| 441 | 5598 | Parkinson's Institute | | 7634 | 3849 | 2538 | 3879 |
| 442 | 6412 | Paparella Ear Head and Neck Institute | | 6788 | 5304 | 2538 | 3879 |
| 443 | 4042 | Pankey Institute | | 4658 | 1933 | 2538 | 3879 |
| 444 | 426 | Palo Alto Research Center | | 2710 | 363 | 317 | 1473 |
| 445 | 1491 | Palo Alto Medical Foundation | | 4135 | 446 | 2538 | 2867 |
| 446 | 3431 | Pacific Whale Foundation | | 4671 | 1152 | 2538 | 3879 |
| 447 | 5403 | Pacific Rim Conservation | | 6414 | 5377 | 2538 | 3509 |
| 448 | 1177 | Pacific Northwest National Laboratory | | 441 | 211 | 27 | 3879 |
| 449 | 4971 | Pacific Northwest Diabetes Research Institute | | 7012 | 4003 | 2445 | 3879 |
| 450 | 6572 | Pacific International Center for High Technology Research | | 6430 | 5601 | 2538 | 3879 |
| 451 | 4704 | Pacific Institute for the Mathematical Sciences | | 1751 | 3198 | 2538 | 3879 |
| 452 | 2614 | Pacific Institute for Studies in Development Environment and Security | | 2749 | 458 | 2538 | 3879 |
| 453 | 1375 | Pacific Institute for Research and Evaluation | | 4431 | 2147 | 1798 | 2002 |
| 454 | 6840 | Pacific Health Research and Education Institute Hawaii | | 7684 | 6601 | 2538 | 3660 |
| 455 | 6523 | Overton Brooks VA Medical Center Shreveport LA | | 7064 | 7126 | 2538 | 3316 |
| 456 | 6095 | Outcomes Research Institute | | 4719 | 5011 | 2538 | 3879 |
| 457 | 218 | Ottawa Health Research Institute | | 1946 | 796 | 108 | 208 |
| 458 | 345 | Ottawa Civic Hospital | | 2352 | 1220 | 1376 | 144 |
| 459 | 4319 | Osiris Therapeutics | | 3743 | 2436 | 2538 | 3879 |
| 460 | 2524 | OSF Saint Francis Medical Center | | 894 | 954 | 2258 | 3879 |
| 461 | 7242 | Oscar G. Johnson VA Medical Center | | 6295 | 7315 | 2538 | 3660 |
| 462 | 7122 | Orthopaedic Research of Virginia | | 5884 | 6526 | 2538 | 3879 |
| 463 | 7235 | Orlando Clinical Research Center | | 7368 | 6589 | 2538 | 3879 |
| 464 | 6930 | Orentreich Foundation for Advancement of Science | | 6922 | 6151 | 2538 | 3879 |
| 465 | 1624 | Oregon Social Learning Centre | | 4795 | 3258 | 1957 | 1891 |
| 466 | 746 | Oregon Research Institute | | 4596 | 1337 | 346 | 1380 |
| 467 | 3110 | Oregon Institute of Science and Medicine | | 6107 | 741 | 2538 | 3879 |
| 468 | 4142 | Oregon College of Oriental Medicine | | 4017 | 2300 | 2521 | 3879 |
| 469 | 4351 | Oregon Clinic | | 4304 | 2446 | 2538 | 3879 |
| 470 | 4545 | Ontario Research Center for Computer Algebra | | 5048 | 2688 | 2538 | 3879 |
| 471 | 7624 | Ontario Hydro Energy | | 8091 | 6958 | 2538 | 3879 |
| 472 | 6790 | Ontar Corporation | | 7725 | 5743 | 2538 | 3879 |
| 473 | 5111 | Omega-3 Research Institute | | 7945 | 2904 | 2538 | 3879 |
| 474 | 4825 | Olive View UCLA Medical Center | | 6277 | 5506 | 2538 | 3252 |
| 475 | 6304 | Olin Neuropsychiatry Research Center | | 7137 | 5079 | 2538 | 3879 |
| 476 | 5776 | Oklahoma State University Medical Center | | 6695 | 4355 | 2538 | 3879 |
| 477 | 685 | Oklahoma Medical Research Foundation | | 2917 | 1694 | 607 | 865 |
| 478 | 4734 | Oklahoma Blood Institute | | 6351 | 2880 | 2538 | 3879 |
| 479 | 3295 | Ohio Supercomputer Center | | 2823 | 1052 | 2538 | 3879 |
| 480 | 2633 | Ohio Aerospace Institute | | 6129 | 3105 | 2538 | 2510 |
| 481 | 4937 | Ogden Clinic | | 5040 | 3284 | 2538 | 3879 |
| 482 | 5077 | Office of Public Health and Environmental Hazards | | 5431 | 3441 | 2538 | 3879 |
| 483 | 3353 | Office of Naval Research | | 2182 | 2970 | 2538 | 3316 |
| 484 | 4565 | Ocular Immunology and Uveitus Foundation | | 5188 | 2710 | 2538 | 3879 |
| 485 | 5188 | Oceanic Institute | | 7271 | 3367 | 2538 | 3879 |
| 486 | 7186 | Ocala Heart and Vascular Institute | | 7553 | 6471 | 2538 | 3879 |
| 487 | 21 | Oak Ridge National Laboratory | | 240 | 46 | 23 | 54 |
| 488 | 922 | Oak Ridge Institute for Science and Education | | 4113 | 899 | 2538 | 834 |
| 489 | 45 | NYU Langone Medical Center | | 451 | 203 | 198 | 32 |
| 490 | 2526 | Nuclear Energy Institute | | 3812 | 371 | 2538 | 3879 |
| 491 | 1758 | Novant Health (Presbyterian Healthcare) | | 728 | 844 | 2377 | 3316 |
| 492 | 7133 | Norwood Clinic | | 7767 | 6303 | 2538 | 3879 |
| 493 | 4275 | Norwalk Hospital | | 4350 | 2325 | 2538 | 3879 |
| 494 | 1493 | Northwestern Medicine (Northwestern Memorial Hospital) | | 573 | 370 | 442 | 3879 |
| 495 | 6523 | Northwest Orthopaedic Institute | | 7255 | 5413 | 2538 | 3879 |
| 496 | 4099 | Northwest Hospital & Medical Center | | 4022 | 2064 | 2538 | 3879 |
| 497 | 544 | Northwell Health (formerly North Shore-LIJ Health System) | | 485 | 316 | 111 | 2487 |
| 498 | 342 | Northshore University Healthsystem | | 809 | 712 | 586 | 537 |
| 499 | 6960 | Northern Rockies Conservation Cooperative | | 8011 | 5721 | 2538 | 3879 |
| 500 | 7829 | Northern California Research Corporation | | 7553 | 7613 | 2538 | 3879 |
