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Population Within a Radius — ZCTA Estimate

Estimate population and housing totals for ZCTAs selected by a map radius, with source records, missing-value coverage and approximate margins of error.

Input & limits

A WGS 84 center and a radius up to 20,015 km. Uses 33,772 ACS ZCTAs matched to 2024 Census internal reference points.

What you download

Selected ZCTA records as GeoJSON and CSV, the radius boundary, and a JSON report with totals, method and uncertainty.

How to use

  1. Enter a center, radius and unit, or choose the center on the optional map.
  2. Calculate to download the ACS reference once and select representative points locally.
  3. Review whole-ZCTA totals and coverage; export all selected records and the method report.

Frequently asked questions

Is this the exact population inside the circle?

No. Complete ZCTA populations are summed when their internal reference points fall inside the circle. Areas cross the circle boundary, so this is a whole-area proxy without population allocation.

Can median incomes be added together?

No. Only additive population and housing estimates are totaled. Median income and median age are not presented as aggregate medians. Missing values are not treated as zero.

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