Shillington is a borough in Berks County, Pennsylvania, United States. With a population of 5,475 at the time of the 2020 census the borough is nestled amongst other suburbs outside Reading. It is perhaps best known for being the location of the homestead to Pennsylvania's first governor, Thomas Mifflin, and as the childhood home of American author John Updike. Many of Updike's stories take place in the fictional town of Olinger, a lightly-disguised version of Shillington, and in its environs.