Black Jack's Bar - Uptown (Resident Evil 3: Nemesis)

It is attacking Brad when you first enter.

Being attacked by a zombie when you first enter.

On the bench next to the payphone, next to the front door.

Behind the bar next to the till.

On the bar.

Appear here after returning here once you have ventured at least two locations away, i.e. by visiting the Business Main Street, the Business Back Street, or the Barricaded Back Passage. Two of the zombies are wandering around, the other is lying down behind the bar.

Note: if you return here after acquiring the Oil Additive and only if you have met Nemesis at the Forked Alley, then the three zombies will be replaced with just one zombie, unless all three have already been killed.