Radius Map Tool
Draw an accurate spherical distance circle in miles or kilometers around any U.S. city, 5-digit ZIP Code, street address, or latitude/longitude coordinates, and inspect every town and ZIP Code inside the circle.
Enter a center city, 5-digit ZIP Code, coordinates, or street address and a radius in miles or kilometers.
Cities & Towns Inside Radius
5-Digit ZIP Codes Inside Radius
Radius map tool Cities within a radius ZIP Codes in a radius Distance between cities Map area calculator
How This Spherical Radius Map Tool Works
This radius map tool draws a true geodesic distance circle (up to 500 miles or 800 kilometers) around any U.S. city, 5-digit ZIP Code, street address, or GPS coordinate by projecting 64 compass bearings outward along the curved surface of the Earth (R = 6,371,008.8 meters), and simultaneously lists every U.S. Census municipality and 5-digit ZIP Code centroid inside that radius.
Why Geodesic Circles Beat Flat Web Mercator Circles
Standard web maps use the Web Mercator projection, which stretches distances east-to-west and north-to-south as you move away from the Equator. At 45°N latitude (such as Minneapolis, Portland, or Montreal), 1 mile on the ground takes up 41% more map pixels than 1 mile at the Equator. If a map tool simply draws a flat screen circle in pixels, its northern and southern edges are miles off from the true distance. QuickWhere solves the forward spherical geodesic equation at every 5.625° of azimuth so every point on the orange boundary ring lies at your exact chosen mileage from the center pin.
What You Get With Every Radius Calculation
- Interactive Boundary Ring & Area: View the geodesic circle on an interactive MapLibre vector map alongside the exact spherical surface cap area in square miles and square kilometers (
A = 2πR²(1 − cos(d/R))) and the N/S/E/W bounding box coordinates. - Cities & Towns Inside the Radius: Automatically scans our 1°×1° spatial grid of 32,642 U.S. Census Bureau Incorporated Places and Census Designated Places and lists matching communities sorted from closest to farthest.
- 5-Digit ZIP Codes Inside the Radius: Loads overlapping 3-digit ZCTA prefix shards from 33,791 U.S. Census 2020 ZIP Code Tabulation Areas and gives you a one-click comma-separated ZIP Code list.
Want a dedicated table view focused purely on municipalities or postal codes? Visit Cities Within a Radius Finder or ZIP Codes in a Radius Finder, or draw custom multi-point shapes on the Map Area Calculator.