You just ask, but take the advice that others have posted and definitely do your due diligence on local market research before asking.

On a side note:

I've had 4 jobs in the past 3 years, and I've had significant pay increases everytime I started with a new employer (except for my current job).

Job 1 -> Job 2: +30%

Job 2 -> Job 3: +50%

Job 3 -> Job 4: -15%

I took a pay decrease for Job 4 as the job was still paying well over the median, was more interesting, and had a way better work environment.

Sometimes the best way to get a raise is to find another job.