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Im putting my entire iphone 6 plus back together and have multiple packs of screws mixed up in one pile, I need to know How many screws are used in the entire back housing part of the phone only, not including the front half?

Not sure I understand your question correctly but here is the guide for replacing the Rear Housing. All of the screws are identified.

Total Screws for iPhone 6 is 35 Here’s the breakdown - 1.2mm x 4 1.3mm x 1 1.4mm x 1 1.5mm x 1 1.6mm x 2 1.7mm x 1 1.9mm x 2 2.1mm x 2 2.2mm x 2 2.3mm x 1 (standoff) 2.6mm x 1 2.9mm x 1 3.1mm x 1 3.2mm x 1 3.6mm x 2 (pentelobe) Total Screws Housing = 23 —————————————— 1.6mm x 6 (3 on each side) 1.7mm x 1 1.9mm x 2 2.2mm x 1 2.3mm x 1 3.0mm x 1 Total Screws Display = 12 —————————————- 1.2mm x 4 1.3mm x 1 1.4mm x 1 1.5mm x 1 1.6mm x 8 1.7mm x 2 1.9mm x 4 2.1mm x 2 2.2mm x 3 2.3mm x 2 (1 x standoff) 2.6mm x 1 2.9mm x 1 3.0mm x 1 3.1mm x 1 3.2mm x 1 3.6mm x 2 (pentelobe) Total Screws Set = 35