Answer: The McKinney-Vento Act remains in Title 42 of the U.S. Code. It can be cited as 42 US Code §§11431-11435. The Every Student Succeeds Act (ESSA) amended it, but didn’t change the title or section headings. ESSA’s amendments to Title I did change some of the section headings, so you should look those up on line. You can see all the homelessness-related provisions of Title I, with their new citations, here: https://schoolhouseconnection.org/wp-content/uploads/2017/05/TitleIPartA.pdf
You can see the McKinney-Vento Act, as amended by ESSA, here: https://schoolhouseconnection.org/wp-content/uploads/2016/12/TextofMV.pdf