| Year | Cornell | Penn | Columbia | Harvard | Brown | Yale | Princeton | Dartmouth |
| 2002 | 13725 | 9917 | 6929 | 6649 | 5774 | 5339 | 4779 | 4084 |
| 2003 | 13655 | 9917 | 6970 | 6597 | 5707 | 5354 | 4837 | 4098 |
| 2004 | 13625 | 10047 | 7082 | 6562 | 5752 | 5319 | 4801 | 4079 |
| 2005 | 13515 | 10422 | 7252 | 6613 | 5903 | 5409 | 4906 | 4110 |
| 2006 | 13562 | 10138 | 7306 | 6715 | 5778 | 5333 | 4923 | 4085 |
| 2007 | 13510 | 10163 | 7231 | 6648 | 5789 | 5311 | 4918 | 4164 |
| 2008 | 13846 | 10275 | 7418 | 6678 | 5846 | 5277 | 4981 | 4147 |
| 2009 | 13931 | 10337 | 7665 | 6655 | 5989 | 5275 | 5113 | 4196 |
| 2010 | 13935 | 10394 | 7934 | 6641 | 6076 | 5310 | 5220 | 4248 |
| 2011 | 14167 | 10301 | 8103 | 6622 | 6096 | 5349 | 5249 | 4194 |
| 2012 | 14261 | 10324 | 8274 | 6610 | 6109 | 5405 | 5336 | 4193 |
| 2013 | 14393 | 10319 | 8365 | 6671 | 6158 | 5430 | 5323 | 4276 |
| 2014 | 14453 | 10406 | 8559 | 6636 | 6243 | 5477 | 5391 | 4289 |
| 2015 | 14315 | 10406 | 8613 | 6634 | 6305 | 5532 | 5402 | 4307 |
| 2016 | 14566 | 10468 | 8712 | 6645 | 6560 | 5472 | 5400 | 4310 |
| 2017 | 14907 | 10496 | 8868 | 6699 | 6653 | 5743 | 5394 | 4410 |
| 2018 | 15182 | 10605 | 8931 | 6722 | 6738 | 5964 | 5428 | 4417 |
| 2019 | 15043 | 10448 | 9001 | 6716 | 6820 | 6092 | 5422 | 4459 |
| 2020 | 14743 | 9960 | 8842 | 5212 | 7043 | 4703 | 5267 | 4170 |
All are Fall semester overall headcount enrollment figures, except that Penn figures refer to full-time undergraduates only, as older headcounts of all Penn undergraduates are not readily available.
Links to sources
Brown: https://oir.brown.edu/institutional-data/factbooks/historical-student-enrollment
Columbia 2002-11: http://web.archive.org/web/20120927063239/http://www.columbia.edu/cu/opir/abstract/opir_enrollment_history_1.htm
Columbia 2011-20: https://opir.columbia.edu/sites/default/files/content/Statistical%20Abstract/opir_enrollment_history.pdf
Cornell: http://irp.dpb.cornell.edu/university-factbook/student-enrollment
Dartmouth: https://www.dartmouth.edu/oir/data-reporting/factbook/enrollment.html
Harvard 2002-11: https://oir.harvard.edu/historical-fact-books
Harvard 2011-20: https://oir.harvard.edu/fact-book/enrollment
Penn 2002-14: http://web.archive.org/web/*/http://www.upenn.edu/about/facts.php
Penn 2015-19: http://web.archive.org/web/20160415000000*/http://www.upenn.edu/about/facts
Penn 2020: https://www.upenn.edu/about/facts
Note: Penn figures here refer to full-time undergraduates, as older headcounts of all undergraduates are not readily available.
Princeton 2002-19: https://registrar.princeton.edu/enrollment#datasets
Princeton 2020: https://www.princeton.edu/meet-princeton/facts-figures
Yale 2002-11: http://web.archive.org/web/20130524121437/http://oir.yale.edu/factsheet-archive
Yale 2012-20: https://oir.yale.edu/sites/default/files/w001_enroll_sum_2021_vf_111020.pdf