Taco Is Gone

I let all four cats out at 6:30 yesterday morning, a little earlier than usual because we were leaving earlier. Bella, Mango and Sumari were back in the house by 8, but I couldn't find Taco.  He ALWAYS comes when I call him. I had a feeling something was wrong, but we had to leave.

We got home at 4 and he wasn't around.  I called him for hours. This morning I put notes on all the neighbor's doors with contact info and descriptions, and talked to a few people. The neighbors here are awesome.  I called animal control and they actually called back and were really nice. I tried to sneak around and call at people's sheds and garages and listen for him.
I know it can be dangerous to let the cats out, but they tear up the house if I don't, plus all of them can squeeze between my legs in an instant and sneak out.  There are plenty of other cats around here, that are out all the time, even at night.
I don't know what else to do.  I miss him so much. He sleeps with me every night.