It's been crazy in the 20 years or so since I was a middle schooler. When I started Middle School at Stevenson, there were 8 middle schools in the district (Stevenson, Rudder, Hobby, Neff, Anson Jones, Pease, Sam Rayburn, and Sul Ross). Now there are 14. There were 4 high schools in the Northside district when I started middle school (Marshall, Holmes, Jay, and Clark). Now there are 10.
When I started at Stevenson, the attendance zone for the school was basically defined by Bandera Road, running out what is now Mainland Road to Heath Road, cutting over on Heath to Grissom, going out Grissom/Culebra to 1604 and then back to Bandera, but including all of Helotes as far out as San Antonio Ranch. At that, the school probably had fewer than 1,500 students and was housed entirely in one building with about 3 portables at most.
Now that same area is served by at least 4 middle schools (Stevenson, Zachry, Stinson, and Jefferson (when it opens). Amazing.