1st place: Bava Kama 77a has 9 words of gemara on it and is thus the shortest amud with words of gemara on it in shas. The Tosfos that fills the page is very VERY big.
A close 2nd place is Yoma 56a with 12 words.
The Shortest Daf in shas that has words on both pages is Nedarim 45a-b which has 69 words (not including Hadran ...
Edit: The longest section of Gemora between Mishayos in the Bomberg edition of Shas is from the first Mishna in Chelek 90a till second Mishna Chelek 107b (about 17.5 daf)
The first mishna in Sanhedrin 2a- 2b till the next Mishna in the second chapter 18a is the second longest gap (16.5 daf).
Pesachim 99b- 114b (14.5 daf)
Bava Basra 42b- 56a (14 daf)