AST's Omega chapter is Minot State College in Minot, ND. Active since 1945.

Alpha Phi's Omega chapter is at the University of Texas, active since 1920

You all are BEAUTIFUL! Thank you and keep it coming!

Delta Phi Epsilon's Omega chapter is at the University of Miami.

Our Omega chapter for AXO is in Washington State University. It's still active, but I don't know when it was established...

ADPi's Omega Chapter was at Louisiana State University from 1914-1985.

From the AXiD forum:

Omega Chapter, Stetson U, founded 1917.

As far as I know, still open.

I don't know if this is "official," but I know my chapter says sisters who have passed have entered Chapter Eternal.

Zeta Psi
 

The Zeta psi's Omega chapter is located at Northwestern University, founded in 1947. It has been inactive since 1993, meaning no current Omega chapter.

APhiA's Omega chapter is for deceased Brothers.

APO's Omega chapter is at Drake University.

Phi Mu Alpha Sinfonia's Omega chapter was chartered at Ohio Wesleyan University on May 24, 1922. I believe that it is currently inactive.

FYI, an earlier thread on the subject:

Omega Chapters.

There is no Omega Chapter. There is, however, an Omega Society for bigtime donors.

Alpha Sigma Alpha
 

Our only single letter chapter is Alpha. We had a few other single letter chapters before our reorganization in 1914 but they all died out or were absorbed by other sororities.

We had our Omega Omega chapter (our double letter chapters are our oldest ones) at San Diego State but it is presently dormant.

We do not have an Omega chapter to denote deceased members or any other chapter that does so.

The Omega Chapter of Chi Omega is for all of our sisters who have passed away.

Omega Delta Phi's Omega chapter is reserved for deceased brothers