The largest horse barn in the United States is a polo barn located in Wellington, Florida. The beautiful timber frame building comprises a total of 78,000 sq-ft under roof. 62,267 sq-ft of the huge structure is the actual horse barn area. There are 130 horse stalls and 10 tack rooms as well as wash stalls and an equine veterinarian area. This first class facility for polo horses was built by Carolina Timberworks.