Wilmington Station (ZWI) sits in downtown Wilmington, Delaware, an Amtrak and SEPTA stop on the Northeast Corridor, not an airport, so the honest answer to any zwi lounge search is that none exists here: no terminal building, no airside area, no lounge of any kind tied to an airline or a card network. The code is a rail-industry identifier, not a signal that air travel facilities sit at this address.
For anyone connecting onward by air, the real lounge picture belongs to Philadelphia International Airport (PHL), roughly twenty five miles north and the closest major gateway for most Wilmington-area travellers. PHL carries a genuine lounge network: American operates Admirals Club locations for its own members, elite frequent flyers, and eligible premium-cabin passengers, and Priority Pass together with several travel-card programs reach additional lounges across the airport's terminals. Which specific lounge and which access route applies depends on your airline, your card, and your terminal at PHL, not on anything at Wilmington Station.
Delaware itself has a small local airport, New Castle Airport (ILG), closer to Wilmington than PHL, but it is not built around a lounge network the way a major hub is, so travellers chasing an actual Priority Pass or airline club experience should plan on Philadelphia rather than a local field. Confirm current lounge hours, eligibility, and terminal locations directly with your airline or card issuer before you fly, since PHL's terminal layout and lounge partnerships do shift over time.
For most people, the practical sequence is: use Wilmington Station purely as the rail leg of the trip, then handle every lounge, access-mode, and timing question at Philadelphia International once you arrive there, where the terminal, security, and premium facilities that a station code alone cannot provide actually exist. Build a little buffer into the connection, since Wilmington itself offers nothing beyond a standard rail platform.