Where number 5 spark plug located on Chevy Suburban?

The location of the #5 spark plug in a Chevy Suburban depends entirely on the engine. Suburbans have used many different engines over the years (V6s, V8s, different displacements). There's no single answer.

To find #5, you must consult a repair manual specific to your Suburban's year and engine. The manual will have a diagram showing the firing order and the location of each spark plug. You can usually find these manuals online (some are free, some are paid). Alternatively, your local auto parts store may have one.