'The National School Lunch Program (NSLP) is the Nation's second largest food and nutrition assistance program. In 2012, it operated in over 100,000 public and nonprofit private schools (grades K-12) and residential child care institutions. The NSLP provided low-cost or free lunches to over 31.6 million children daily at a cost of $11.6 billion.'
LINK: http://www.ers.usda.gov/topics/food-nut ... ogram.aspx
Source: ERS-USDA (2013).