Okla. Stat. tit. 12, § 12-1653: Parties - Venue

A. When a declaratory relief is sought, all persons shall be

made parties who have or claim any interest which would be affected

by the declaration, and no declaration shall prejudice the rights of

persons not parties to the proceeding.

B. The venue of the action shall be established by existing

statutes; provided, however, where the action involves an individual

defendant, the venue shall be in the county of the defendant’s

residence or where the defendant may be served with summons. If the

action involves two or more defendants who reside in different

counties, the venue shall be in any county where any defendant

resides or may be served with summons. Where the action has as a

defendant the Department of Corrections, the Board of Corrections or

any of the agents, officers or employees of the Department or Board,

the venue shall be in the county of the official residence of the

Department or Board.

C. In any proceeding which involves the validity of a municipal

ordinance or regulation, the municipality shall be made a party, and

shall be entitled to be heard, and if a statute or regulation is

alleged to be unconstitutional, the Attorney General of the state

shall also be served with a copy of the proceeding and be entitled

to be heard.