Plymouth Meeting is a census-designated place that straddles Plymouth and Whitemarsh Townships in Montgomery County, Pennsylvania, United States. The settlement was founded in 1686.The population of Plymouth Meeting was 6,177 in the 2010 census. Plymouth Meeting is home to the Colonial School District, the recently renovated Plymouth Meeting Mall and several large office parks and shopping centers. It was home to IKEA's U.S. headquarters. The confluence of the Pennsylvania Turnpike, the Blue Route and the Northeast Extension of the Pennsylvania Turnpike at the Mid-County Interchange occur in Plymouth Meeting. This interchange contributes to regional commerce and was a major driver for business and retail development.