Easy County Data Map Builder

Developed by John Corbin
Please note, saved templates and browser storage may not be compatible with future versions during the development phase. For best results, export an html/pdf version as a back-up until the development period ends. Thank you!
Loading boundaries…
Counties load after you change this.
Saved to this browser (localStorage).
Applies recommended legend groups, scale, and color settings. You can still adjust after.
Does not change your county values.
Use a midpoint (e.g., 0) for above/below maps.
Enter breakpoints as comma-separated numbers (must be ascending). Example: 0, 5, 10, 20, 50
Histogram updates as you edit values. (Bins are approximate.)
Exported SVG/PNG/HTML uses this size.
Numeric values only. Paste CSV/TSV lines like: Allegany, 12.3 or County<TAB>Value
Optional fields shown in tooltips/pins and saved with the dataset.
Turn off if you only want these fields for internal notes.
County Value
Data point: Reference: With values: Min: Max:
100%
County Map Reference: — Export size 1200×800
Description
Methodology
References