Coverage analysis
What 30 minutes covers in Portland.
Portland is bisected by the Willamette River with a limited number of bridges, and hemmed in by the Tualatin Mountains to the west — both factors warp drive-time polygons in ways that catch newcomers off guard. The urban growth boundary creates a hard cap on suburban reach that few other US metros share.
At 30 minutes, the Portland 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 Portland'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 652,503 and a median household income of $78,476 give a sense of Portland'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.