Yes, provided that the URL address does not misrepresent the identity of your company or contain any misleading, deceptive, or otherwise prohibited language. URL addresses may be used as DBA names upon request to and approval from DFI. See also WAC 208-620-620 and 208-620-622.
Wash. Admin. Code § 208-620-621
Statutory Authority: RCW 43.320.040, 31.04.165 and 2010 c 35. 10-20-122, § 208-620-621, filed 10/5/10, effective 11/5/10.