A couple additions for the University of Illinois in Urbana/Champaign.
Kappa Delta and Alpha Delta Theta were both founded in 1923.
In terms of defunct houses, if you want to add them:
- Sigma Phi Beta was founded in 1929.
- Beta Sigma Omicron, 1927
- Lambda Omega (Beta Chapter) 1923
- Delta Sigma Epsilon was listed as taking pledges with the other houses in 1956, but I couldn't find the founding date.