Will US PS4 work on 220V?

While "officially" Sony says North American PlayStation 4 consoles only accept 120 V, the power supplies the console actually ships with do support 100-240V at 50 or 60 Hz. This is confirmed by an iFixit thread asking this same question:

jrjessjuliet: Ok guys this is the final answer and please take note!! All ps4 models irrespective of region or model number are dual voltage! It's a portable console so it can travel with you to any country from 110v to 240v since it has a voltage regulator build in. I'm living in Malaysia with 240v but I'm using an Amazon PS4 from US with a rated 120v without any issues!!!

...

Joe: The ps4 120 V is dual voltage.. I took the risk; I plugged it in and it works . Don t worry guys ;)

You can safely verify this yourself by checking for this label underneath your PS4, near where the power cord attaches:

The above picture was taken from iFixit's PlayStation 4 teardown, which also states:

The power supply is rated at an AC Input of 100-240 volts. This means you can take your game around the world with your trusty PS4 always at your side; just remember to bring your power socket adapters.