I worked the entire year in PA but I resided part of the year in PA and part of the year in VA which are coop. states. How do I file my income so I am not double taxed

[TomD8]

If you moved from PA to VA during the tax year, then you will file a part-year resident tax return in each of the two states.

PA can tax all your income earned as a PA resident; VA can tax all your income earned after your move to VA.

How do I file a part-year state return? (intuit.com)

If you haven't already done so, then you should file PA Form REV-419 with your PA employer, declaring your VA residency.  This will tell your employer not to withhold PA taxes from your pay.  Here's a link to that form:

https://www.revenue.pa.gov/FormsandPublications/FormsforBusinesses/EmployerWithholding/Documents/rev...