Population Within a Radius

Estimated population within 1, 3, and 5 mile rings around downtown Chicago
Estimated population within 1, 3, and 5 miles of downtown Chicago — the standard site-selection rings. · Map data © OpenStreetMap contributors

Population within a radius, from official Census counts

Drop a point and this tool estimates the 2020 US Census population inside the circle — area-weighting each ZIP so partial ones count in proportion — with a single custom radius or 1, 3, and 5-mile rings, the format retail and restaurant site-selection teams use.

The numbers are official 2020 Census counts (a 100% enumeration), not modeled estimates from a commercial data vendor — so you can cite the source. Every figure is an estimate at the ZIP level and rounded accordingly.

Why 1, 3, and 5-mile rings?

Concentric 1/3/5-mile rings are the default trade-area geometry in retail site selection. The 1-mile ring is the immediate walk-in catchment; the 3-mile ring is the primary market that drives most visits; the 5-mile ring is the secondary market. Reading population as cumulative circles (and the incremental band each ring adds) is exactly how a store-location analyst sizes a candidate site.

Need a different distance? Switch to custom radius for a single circle, toggle miles or kilometers, and export the ring table to CSV for your spreadsheet or deck. To see the specific ZIP codes inside a radius instead of a population total, use the ZIP code radius tool.

Method, accuracy, and coverage

Each ZIP area (ZCTA) is approximated as a circle of the same land area at its point, and its 2020 population is counted by how much of that circle your radius overlaps — full overlap counts fully, partial overlap counts partially. This area-overlap weighting keeps a large rural ZIP from dropping to zero just because its center sits outside a moderate circle. Boundaries are still approximated, so figures are estimates — most accurate at radii larger than the local ZIP areas.

Coverage is all 50 states, DC, and Puerto Rico. US island territories (US Virgin Islands, Guam, American Samoa, Northern Mariana Islands) have no 2020 ZCTA population and will read zero. For a straight distance circle without population, see the radius map; to measure land area instead of population, the area calculator traces any shape.

Frequently Asked Questions

How is the population within a radius estimated?
Each ZIP area (ZCTA) is approximated as a circle of the same land area at its location, and the tool counts its 2020 Census population in proportion to how much of that circle your radius covers — full overlap counts fully, a partial overlap counts partially, no overlap counts zero. This area-overlap weighting is why a large rural ZIP still contributes when a circle only clips its edge. Boundaries are approximated, so figures are estimates — most accurate at radii larger than the local ZIP areas.
Why is this different from an ESRI or commercial site-selection report?
The figures here come straight from official US Census 2020 counts (Demographic and Housing Characteristics table P1) — a 100% enumeration in the public domain — not modeled estimates or projections resold by a commercial data aggregator. Paid reports add apportionment (splitting partial ZIPs by area or address counts) and current-year projections; this free tool trades that refinement for transparency and an authoritative, citable source.
Can I export the ring populations?
Yes. In 1-3-5 ring mode, "Export CSV" downloads the ring table — each ring, its incremental population, the cumulative population, and the cumulative ZIP count — ready to drop into a site-selection deck or spreadsheet.
What radius should I use for site selection?
Retail and restaurant site selection conventionally uses 1, 3, and 5-mile rings (or 5/10/15-minute drive times) around a candidate site — 1 mile for the immediate trade area, 3 miles for the primary market, and 5 miles for the secondary market. Those three rings are the default here; switch to a custom radius for anything else.
Which areas are covered?
All 50 states, Washington DC, and Puerto Rico are covered from the 2020 Census ZCTA data. US island territories (US Virgin Islands, Guam, American Samoa, Northern Mariana Islands) have no 2020 ZCTA population and will read zero — a limitation of the source data, not the tool.