I live in a house built in the 1960's.

My gas meter output branches into two pipes that enter the wall of my house approximately one foot horizontally from each other and at the same verical height approximately six inches above grade.

My meter and supply pipes are located on the south wall in the west corner of the house. The house footprint is rectangular. The utility room with gas fed water heaters and furnaces are located in the north east corner of the house.

A gas pipe enters the utility room at approximately six feet above where it enters the exterior wall. Obviously, somewhere between the entry through the exterior wall and the appearance in the utility room the gas pipe(s) rise about six feet and make a couple of turns and make an extended run through the space between the upstairs floor and downstairs ceiling.

Since everything on both levels is finished I can't visually trace the pipe run.

I wish to branch off the existing supply to install a new stove.

Is there any way to trace the gas run to figure out where to tap into the existing line other than tearing out drywall and flooring to visually identify the path of the run?

Surely we are talking iron pipe. Try a metal detector or even a stud detector. Start near where the pipe disappears into the wall and see what kind of reading you get.