Altamonte Springs is a suburban city in Central Florida in Seminole County, Florida, United States, which had a population of 46,231 at the 2020 United States Census. The city is in the northern suburbs of the Orlando–Kissimmee–Sanford Metropolitan Statistical Area, which the United States Census Bureau estimated had a population of 2,054,574 in 2008.Dr. Washington Kilmer of Cincinnati was the first person of European background to settle into the area circa 1870, and he named the area Altamonte.