Location Intelligence
A five-mile circle is not your patient trade area.
A radius tells you what is nearby. Travel analysis helps you ask what is reachable. Neither, by itself, tells you where patients will choose to go.
Beyond the Circle
Nearby and convenient are different questions.
Drawing a circle around an address is a useful first step. It creates a consistent area for comparing population, households, and nearby services. But the circle does not know where the bridge is, which road has an entrance, or how a patient will reach the front door.
For healthcare real estate, the next question is whether the geography reflects a plausible journey to care. That means considering the route, the service, and the people the location is meant to serve.
Three Different Views
Be clear about what the boundary means.
Radius
A straight-line distance around a location. Useful for consistent screening, but not a representation of a road journey.
Travel-time area
A modeled reachable area under specified travel conditions. Its usefulness depends on the network, travel mode, and assumptions.
Observed patient origins
Where an existing location’s patients come from. Where lawfully available and appropriately aggregated, this can help test a proposed boundary.
The road network changes the map.
Imagine a hypothetical clinic near a river. Homes across the water may sit inside a small radius, yet reaching the clinic requires a trip to a distant bridge. Homes farther away along a direct road could have an easier journey. A circle treats those distances geometrically; a network analysis can test the route.
Esri’s service-area documentation describes how reachable areas are calculated using travel costs and cutoffs. It also explains why travel toward a facility can produce a different result from travel away from it when directional restrictions or travel times differ.
A drive-time label is not enough.
A “15-minute trade area” needs an explanation. Fifteen minutes by what mode? At what time? Toward which entrance? With static speeds or traffic-aware routing?
The same Esri guidance distinguishes static travel times from analyses that use time-dependent traffic or transit data. Specifying a departure or arrival scenario only makes those conditions meaningful if the underlying network supports them.
For a market evaluation, document the assumptions and consider more than one plausible scenario. The purpose is not to find a universal travel threshold. It is to understand how sensitive the location’s apparent reach is to the conditions you choose.
Reachability is not patient preference.
A travel-time polygon estimates access under a model. It does not establish that residents inside it will become patients, or that residents outside it will not. Referral relationships, service availability, payer networks, and personal preferences still need investigation.
As a planning hypothesis, a frequent-visit service deserves questions about repeated travel burden, while a referral-based specialty service deserves questions about referral reach. Those are prompts for validation, not fixed rules about how far any patient will travel.
Driving is also only one possible journey. If the intended population relies on transit, walking, or assistance from others, a car-only analysis may not answer the relevant access question.
A practical trade-area review.
- Check the location. Verify the patient entrance, road connection, and geocoded point rather than relying only on the street address.
- Compare scenarios consistently. Use the same travel settings when comparing candidate sites, and identify why any exceptions are necessary.
- Respect the data geography. If a boundary cuts through census areas, explain how demographic totals were estimated. Do not imply exact household counts where allocation was modeled.
- Walk the last part of the trip. Examine parking, pedestrian access, and building entry alongside the network analysis.
From Distance to Access
A better boundary starts with a better journey.
Modeled access is not guaranteed access.
Travel results depend on data, routing settings, and conditions. No radius or drive-time threshold in this article is a recommended standard. A modeled trade area is not a patient-volume forecast or a regulatory network-adequacy determination.
Sources and further reading.
Source guidance reviewed September 18, 2026. The healthcare planning framework and river example are editorial interpretation, not findings from an Esri study.