Do I file in DC if live in PA but received DC unemployment?

Since no tax was withheld, there is no return to file.    You only need to file a DC return if one of the situations found here applies.  

[Edited 05/12/21   1:16 PM]

Thanks! No DC tax was withheld, and DC does not tax nonresidents. So, I don't think there would even be any credit to claim? 

No. You do not have to file a DC return. Nonresidents are non-taxable in DC. Nonresidents who erroneously had DC income tax withheld or made DC estimated tax payments may file Form D-40B to request a refund. However, since no tax was withheld, you do not need to file a return. 

Per Individual Income Tax Filing FAQs, Do I have to file a DC income tax return?
You must file a DC tax return if:

• You were a resident of the District of Columbia and you were required to file a federal tax return. (A resident is an individual domiciled in DC at any time during the taxable year);
• You maintained a place of abode in DC for a total of 183 days or more even if your permanent home was outside of DC;
• You were a part-year resident of DC (see instructions for part-year residents);
• You were a member of the United States (U.S.) armed forces and your home of record was the District of Columbia for either part of or the full taxable year;
• You are the spouse of an exempt military person or of any other exempt person such as a nonresident presidential appointee or an elected official;
• If you want to receive a refund of DC taxes withheld during the year, or if you qualify for and want to receive the following refundable credits:
  • The DC Earned Income Tax Credit;
  • Schedule N, Non-Custodial Parent Earned Income Tax Credit;
  • Schedule H, Homeowner and Renter Property Tax Credit; or
  • Schedule ELC, Keep Child Care Affordable Tax Credit (formerly Early Learning Tax Credit).

@sab82