| 1901 | 13499 | Oak Hills Christian College |  | 11343 | 8370 | 7223 |
| 1902 | 15768 | Oak Point University | | 14150 | 8370 | 7223 |
| 1903 | 9681 | Oakland City University | | 6260 | 8370 | 7223 |
| 1904 | 8737 | Oakland Community College | | 4884 | 8370 | 7223 |
| 1905 | 863 | Oakland University | | 803 | 807 | 1346 |
| 1906 | 7120 | Oakton Community College | | 2520 | 8370 | 7223 |
| 1907 | 8666 | Oakwood University | | 4791 | 8370 | 7223 |
| 1908 | 1732 | Oberlin College | | 704 | 2524 | 3369 |
| 1909 | 12485 | Oblate School of Theology | | 10039 | 8370 | 7223 |
| 1910 | 2101 | Occidental College | | 1084 | 2853 | 3607 |
| 1911 | 9000 | Ocean County College | | 5256 | 8370 | 7223 |
| 1912 | 13338 | Oconee Fall Line Technical College (Sandersville + Heart of Georgia) | | 11157 | 8370 | 7223 |
| 1913 | 8994 | Odessa College | | 5244 | 8370 | 7223 |
| 1914 | 11005 | Ogden Weber Applied Technology College | | 8110 | 8370 | 7223 |
| 1915 | 11480 | Ogeechee Technical College | | 8737 | 8370 | 7223 |
| 1916 | 7815 | Oglala Lakota College | | 3615 | 8370 | 7223 |
| 1917 | 7601 | Oglethorpe University | | 3277 | 8370 | 7223 |
| 1918 | 13700 | Ohio Business College | | 11575 | 8370 | 7223 |
| 1919 | 9909 | Ohio Christian University (Circleville Bible College) | | 6582 | 8370 | 7223 |
| 1920 | 9217 | Ohio Dominican University | | 5587 | 8370 | 7223 |
| 1921 | 3516 | Ohio Northern University | | 2266 | 3902 | 4984 |
| 1922 | 34 | Ohio State University | | 40 | 72 | 53 |
| 1923 | 13591 | Ohio Technical College | | 11435 | 8370 | 7223 |
| 1924 | 604 | Ohio University | | 394 | 590 | 1134 |
| 1925 | 3795 | Ohio Wesleyan University | | 1816 | 5087 | 5302 |
| 1926 | 8065 | Ohlone College | | 3956 | 8370 | 7223 |
| 1927 | 8666 | Oklahoma Baptist University | | 4795 | 8370 | 7223 |
| 1928 | 6929 | Oklahoma Christian University | | 3929 | 7391 | 7223 |
| 1929 | 8340 | Oklahoma City Community College | | 4331 | 8370 | 7223 |
| 1930 | 5569 | Oklahoma City University | | 2963 | 7138 | 6592 |
| 1931 | 9149 | Oklahoma Panhandle State University | | 5468 | 8370 | 7223 |
| 1932 | 358 | Oklahoma State University Stillwater | | 217 | 385 | 648 |
| 1933 | 9640 | Oklahoma Wesleyan University | | 6192 | 8370 | 7223 |
| 1934 | 477 | Old Dominion University | | 251 | 498 | 948 |
| 1935 | 11662 | Olivet College | | 8966 | 8370 | 7223 |
| 1936 | 6769 | Olivet Nazarene University | | 1875 | 8370 | 7223 |
| 1937 | 8559 | Olympic College | | 4621 | 8370 | 7223 |
| 1938 | 7012 | Oral Roberts University | | 2596 | 8282 | 7223 |
| 1939 | 7505 | Orange Coast College | | 3145 | 8370 | 7223 |
| 1940 | 11850 | Orangeburg Calhoun Technical College | | 9237 | 8370 | 7223 |
| 1941 | 10664 | Oregon Coast Community College | | 7643 | 8370 | 7223 |
| 1942 | 13126 | Oregon College of Oriental Medicine | | 10857 | 8370 | 7223 |
| 1943 | 260 | Oregon Health & Science University | | 373 | 191 | 263 |
| 1944 | 3377 | Oregon Institute of Technology | | 2902 | 4963 | 4324 |
| 1945 | 129 | Oregon State University | | 62 | 142 | 391 |
| 1946 | 9790 | Oregon State University Cascades | | 6423 | 8370 | 7223 |
| 1947 | 17768 | Orleans Tech Institute | | 16547 | 8370 | 7223 |
| 1948 | 13478 | Otero College | | 11303 | 8370 | 7223 |
| 1949 | 7185 | Otis College of Art & Design | | 2626 | 8370 | 7223 |
| 1950 | 7490 | Ottawa University | | 3112 | 8370 | 7223 |
| 1951 | 6121 | Otterbein University | | 2482 | 6261 | 7223 |
| 1952 | 6642 | Ouachita Baptist University | | 3563 | 6944 | 7223 |
| 1953 | 6341 | Our Lady of the Lake University | | 4158 | 8282 | 6592 |
| 1954 | 8215 | Owens Community College | | 4166 | 8370 | 7223 |
| 1955 | 10643 | Owensboro Community and Technical College | | 7596 | 8370 | 7223 |
| 1956 | 19324 | Oxford Graduate School Dayton | | 18363 | 8370 | 7223 |
| 1957 | 9166 | Oxnard College | | 5503 | 8370 | 7223 |
| 1958 | 7056 | Ozark Christian College | | 2414 | 8370 | 7223 |
| 1959 | 13311 | Ozarka College | | 11108 | 8370 | 7223 |
| 1960 | 8131 | Ozarks Technical Community College | | 4047 | 8370 | 7223 |
| 1961 | 1397 | Pace University | | 581 | 1539 | 3010 |
| 1962 | 7536 | Pacific College of Oriental Medicine | | 3175 | 8370 | 7223 |
| 1963 | 2772 | Pacific Lutheran University | | 1778 | 3663 | 4131 |
| 1964 | 9476 | Pacific Oaks College | | 5959 | 8370 | 7223 |
| 1965 | 7130 | Pacific School of Religion | | 7386 | 4436 | 7223 |
| 1966 | 11507 | Pacific States University | | 8760 | 8370 | 7223 |
| 1967 | 7870 | Pacific Union College | | 3692 | 8370 | 7223 |
| 1968 | 2844 | Pacific University Oregon | | 1401 | 3636 | 4529 |
| 1969 | 9473 | Pacifica Graduate Institute | | 5944 | 8370 | 7223 |
| 1970 | 18284 | Paier College of Art | | 17163 | 8370 | 7223 |
| 1971 | 10024 | Paine College | | 6736 | 8370 | 7223 |
| 1972 | 6677 | Palm Beach Atlantic University | | 4054 | 6534 | 7223 |
| 1973 | 7617 | Palm Beach State College | | 3319 | 8370 | 7223 |
| 1974 | 7578 | Palmer College of Chiropractic | | 3236 | 8370 | 7223 |
| 1975 | 3272 | Palo Alto University (Pacific Graduate School of Psychology) | | 5688 | 3344 | 3592 |
| 1976 | 13826 | Palo Verde College | | 11740 | 8370 | 7223 |
| 1977 | 5953 | Palomar College | | 707 | 8370 | 7223 |
| 1978 | 14228 | Pamlico Community College | | 12243 | 8370 | 7223 |
| 1979 | 11033 | Panola College | | 8132 | 8370 | 7223 |
| 1980 | 10643 | Paradise Valley Community College | | 7599 | 8370 | 7223 |
| 1981 | 14019 | Pardee Rand Graduate School | | 11972 | 8370 | 7223 |
| 1982 | 11278 | Paris Junior College | | 8451 | 8370 | 7223 |
| 1983 | 5018 | Park University | | 2599 | 6462 | 6279 |
| 1984 | 9285 | Parker University (College of Chiropractic) | | 5666 | 8370 | 7223 |
| 1985 | 7350 | Parkland College | | 2877 | 8370 | 7223 |
| 1986 | 6926 | Pasadena City College | | 2158 | 8370 | 7223 |
| 1987 | 9599 | Pasco Hernando State College | | 6132 | 8370 | 7223 |
| 1988 | 9487 | Passaic County Community College | | 5978 | 8370 | 7223 |
| 1989 | 9129 | Patrick Henry College | | 5446 | 8370 | 7223 |
| 1990 | 17253 | Patrick Henry Community College | | 15912 | 8370 | 7223 |
| 1991 | 22284 | Patten Educational Foundation | | 21763 | 8370 | 7223 |
| 1992 | 6858 | Paul D Camp Community College | | 2046 | 8370 | 7223 |
| 1993 | 10936 | Paul Quinn College | | 8009 | 8370 | 7223 |
| 1994 | 8265 | Paul Smith's College | | 4236 | 8370 | 7223 |
| 1995 | 10364 | Pearl River Community College | | 7200 | 8370 | 7223 |
| 1996 | 8635 | Pellissippi State Technical Community College | | 4746 | 8370 | 7223 |
| 1997 | 9364 | Peninsula College | | 5785 | 8370 | 7223 |
| 1998 | 6657 | Penn Foster College | | 1682 | 8370 | 7223 |
| 1999 | 14080 | Pennco Tech | | 12055 | 8370 | 7223 |
| 2000 | 7395 | Pennsylvania Academy of the Fine Arts | | 2955 | 8370 | 7223 |
