Kingston King (born April 7, 2005), professionally known as AC640, is an American recording artist hailing from Northwest, Washington D.C.

AC640 began his music career in 2024 after being told by fellow DMV artist and his close friend LawDat that he could seek success if he started rapping. He would drop his first two songs, “Just Gtf In” and “1989 BoJackson,” back-to-back in February of that year, which almost immediately gained thousands of views on YouTube, pushing him to pursue a career in rapping. Near the end of 2024, he signed a distribution deal with Santa Anna Records.