Rohnert Park -- now Sonoma County's third largest city -- is also one of the County's youngest. In 1956, only four people were living in the the City's current boundaries and nearly all of it consisted of the Rohnert Seed Farm, which at the time, was a major horticultural business. That changed rapidly after developers Pete Golis and Maurice Fredericks purchased the seed farm and began building a new planned city. When residents of the 1,325-acre community voted to incorporate in the summer of 1962, 2,775 people were living in the new city. By 2020, the population had grown by over 1500% to 44,390 residents and the City now covers 7 square miles of land.