It actually turns out that the Wake County Public School System is now the 16th-largest school district in the nation..
I didn't factor in that Wake's 146,687 students had also moved it ahead of the falling enrollment this year in the School District of Philadelphia. I had previously blogged about how Wake had moved ahead of Montgomery County Public Schools in Maryland, which has 146,497 students this year.
In the case of Philadelphia, Wake's national ranking changed because the Pennsylvania school district is losing students at a fast rate. This year, Philadelphia has 146,090 students. The district had 154,482 students in the 2010-11 school year.
Philadelphia, like a lot of Northeastern cities, is losing people. The school district had 167,000 students five years ago.
Although Wake moved up two spots this year, it will probably be a few years before it climbs into the top 15 in enrollment. The 15th-largest district is the Dallas Independent School District, which has 157,000 students, a number that's stayed fairly stable over the past few years.