Plainville is a hamlet on NY Route 370, approximately 4.5 miles west of Baldwinsville in Onondaga County, New York, United States. It is noted for the extensive Plainville Turkey Farms, which remained in the same family from 1835 until the business was sold in 2007 to Hain Celestial Group. The former Plainville turkey processing operations were relocated to Pen…Plainville is a hamlet on NY Route 370, approximately 4.5 miles west of Baldwinsville in Onondaga County, New York, United States. It is noted for the extensive Plainville Turkey Farms, which remained in the same family from 1835 until the business was sold in 2007 to Hain Celestial Group. The former Plainville turkey processing operations were relocated to Pennsylvania in 2009, and the Plainville plant was shut down in 2010.