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 Altamont (minus the “e” from the present spelling) after Altamont, New York, an area near his childhood home. In 1882, the Altamonte Land, Hotel and Navigation Company, founded by Thomas C. Simpson and four other Massachusetts businessmen, gave the area its present name: Altamonte Springs. The company developed the core community along Altamonte Avenue (today’s SR 436) between Maitland and Longwood Avenues (today’s Ronald Reagan Boulevard). On November 11, 1920, the residents of Altamonte Springs voted 38 to 7 in favor of incorporation.