I think the number being floated at the beginning of 0bama’s reign was 11 million, which was probably a low-ball estimate, if even any effort was made to offer a reliable figure.
Based on 0bama’s open-borders policies, my guesss is that the actual number by 2018 is in the range of (at least) 40-50 million in the entire US. JMHO
The 11 million number has been around since GWB took office and first tried for amnesty until 9/11 got in the way.