Coverage analysis
What 30 minutes covers in San Antonio.
San Antonio's loop system (410 and 1604) and radial highways produce cleanly tiered drive-time bands — but rapid northward growth into the Hill Country and along I-10 toward Boerne means trade-area templates from even a few years ago understate suburban reach.
At 30 minutes, the San Antonio 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 San Antonio'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 1,434,625 and a median household income of $52,455 give a sense of San Antonio'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.