The school most prominently featured is Springfield Elementary. This is the school that Bart and Lisa have attended for the shows entire duration. Other schools that have been featured include an unnamed school for the gifted that Bart attended after switching IQ tests with Martin, and Springfield University (The Towns College).
The same as they are today.
Season Five's Cape Feare
Guy IncognitoMike RotchAmanda HugnkissMax PowerIvanna Tinkle
Lisa,Bart,Maggie,Marge and HOMER. also Krusty and Moe
Kang and Kodos
Nelson, Jimbo and, Kearney
The same as they are today.
The names of schools in the area are: List of schools in the specific area.
Kirk, Luanne and Millhouse.
snowball1, snowball2 and snowball3
The two aliens on The Simpsons during Halloween are called Kang and Kodos.
His own family, except for Bart.
Lisa, Bart and Maggie
Season Five's Cape Feare
6 schools
Honestly there are far too many to list them here and frankly their names you'd never know since The Simpsons is animated in Korea. Your best bet is to watch the credits to the end, freeze frame and read the names.
Sarah, Samantha, Bella, Erica, Rebecca and Kira