Coverage analysis
What 30 minutes covers in Philadelphia.
Philadelphia's drive-time geometry is shaped by two rivers (the Delaware and the Schuylkill), a constrained bridge network into New Jersey, and a Main Line suburban corridor along the old Pennsylvania Railroad. Trade areas frequently span four states' worth of tax and regulatory regimes.
At 30 minutes, the Philadelphia isochrone captures the regional catchment — a zone where trips are planned but customers are willing to cross neighborhood boundaries. Unlike a 100–350 km² circle, the real road-network polygon follows Philadelphia's actual highway corridors, accounts for bridge and interchange chokepoints, and respects the natural and built barriers that force drivers to detour.
Best-fit categories at 30 minutes: Big-box, regional dining, car dealership, furniture, healthcare anchor, sporting goods. The 30-minute isochrone is the standard input for cannibalization studies and multi-unit expansion modeling.
The city-level population of 1,603,797 and a median household income of $52,649 give a sense of Philadelphia's economic density, but the figure that matters for site selection is the population inside the polygon — not the city as a whole. That number shifts dramatically depending on whether you're drawing from a high-density urban core or a lower-density suburban corridor. Use the tool above to set your actual candidate location, then generate the isochrone to see the real catchment.