Potato farms, dairy farms, and even broccoli and pea farms. However, there is a good chance that you have never really had a chance to experience one of our farms firsthand. According to an article on the WABI website, the 37th Annual Maine Open Farm Day is this Sunday. This is the day where visitors an opportunity to explore more than 80 working farms across 15 counties. You can check out a full list of participating farms HEREThe 25 Largest Employers in Maine Below is a list of the 40 largest employers in Maine.