Puerto Rico was split out of the main food-stamps program in 1982, and is now funded with a block grant. So, it is not included in an any of the statistics on the USDA website. However, according to the CFDA, there were 1,352,536 Puerto Ricans on food stamps in 2011, at a cost of $1.9 billion. That comes to a monthly benefit of $117 per person.
The number of Puerto Ricans on food stamps should be added to the “official” total as shown on the Food Stamps Charts page. Also, the population of Puerto Rico was 3,979,000 in the 2010 Census, so a whopping 34% of the island is on food stamps.