The 2020 Census will lead to a reapportionment of Congressional Districts. Since each state receives electoral votes equal to its number of Districts (+2 for its Senators), the electoral map will be changing for the 2024 presidential election. Based on the late 2017 estimate by Election Data Services, TX and FL will be the big winners, gaining 3 and 2 electoral votes, respectively. AZ, CO, NC and OR will gain one each. As the number of electoral votes is fixed, these 9 increased votes must come from somewhere else. The current projection is that nine states (AL, IL, MI, MN, NY, OH, PA, RI, WV) are on track to lose one each.
The interactive map below shows that if the projected 2024 map had been in place in 2016, Trump would have won 308 electoral votes, 2 more than the 306 he actually won (excluding faithless electors).