From the record
“The Main Street Historic District in Tampico, Illinois, United States, is a historic district notable as home to the birthplace of Ronald Reagan. The district includes the late 19th century collection of buildings that comprise Tampico's central business district; among them are two apartments that the Reagan family occupied in the early 1900s.”
Wikipedia article Main Street Historic District (Tampico, Illinois), CC BY-SA 4.0.
One of 11 National Register listings published here for Whiteside County · listed in 1982 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article