DHS maintains official statistics of various metrics, which can be found on their website. Here's an example set: https://www.dhs.gov/publication/entryexit-ove

DHS maintains official statistics of various metrics, which can be found on their website. Here's an example set: https://www.dhs.gov/publication/entryexit-overstay-report https://www.dhs.gov/publication/entryexit-overstay-report CBP also maintains statistics: https://www.cbp.gov/newsroom/stats/sw-border-migration https://www.cbp.gov/newsroom/stats/sw-border-migration In the private sector, Pew Research (a well regarded, nonpartisan institution) generates statistics using loads of studies. See, e.g., https://www.pewresearch.org/fact-tank/2019/06/12/us-unauthorized-immigrant-population-2017/ https://www.pewresearch.org/fact-tank/2019/06/12/us-unauthor... These are all readily found using some basic Google searches.