Nassau County is in Northeast Florida. Of the 67 counties in the Sunshine State, Nassau County ranks 42nd in terms of size (464,588 acres). Browse all Nassau County horse farms for sale on the Land Network to find the equestrian property that's right for your future needs, whether you're a horse breeder, equestrian business or simply horse lover looking for stable facilities, grooming pens or grazing pasture for your own horses. The most common type of land for sale by combined acreage in Nassau County is residential property.