Step 1
Open the HTML file
No install. Double-click to open in your browser.
See it live
Distance between any two ZIPs, instantly.
Radius lists
Everything inside the ring.
Enter a center ZIP and a radius and get back every ZIP in range, ranked by distance, ready to paste into your CRM.
Radius search
Proximity bands
Sort the book by how close it is.
Drop in your account list and the engine buckets each one into distance bands, so you can plan a route or a day instead of guessing.
Proximity bands
The Problem
Knowing how far apart two accounts are should not require a mapping subscription.
Reps waste time eyeballing maps to figure out which accounts are close enough to hit in one trip. Web mapping tools meter your lookups, need a connection, and send your account list to someone else's server.
The Postal Code Distance Engine answers the proximity question locally. It carries 57,754 US ZIP codes inside the file, so distance, radius, and banding all work with no connection and no per-lookup cost.
How It Works
Three steps from ZIPs to a route.
Step 2
Enter a ZIP, or paste a list
One pair for a single distance, or a whole column for banding.
Step 3
Read or export
Get distances and bands on screen, export to CSV.
What You Get
Built for the way reps actually work.
- ZIP-to-ZIP distance for any US pair
- Radius lists ranked by distance
- Automatic proximity banding for an account list
- CSV import (paste, upload, drag and drop) and CSV export
- 57,754 US ZIP codes embedded, fully offline
- No API key, no account, no data leaves your browser
Data Coverage
Offline, embedded, current.
57,754 US ZIP codes embedded
38,922 verified and 18,833 interpolated, built into the file. No internet connection, no API key, and your data never leaves your browser.
ProxiSuite
The other product lines.
Every ProxiField tool runs on the same proximity engine that powers the rest of the suite. When you outgrow offline files, the hosted side picks up where these leave off.
The online version
The hosted, login-gated version of these tools, with saved data and bigger datasets. See it online
ProxiMed
Healthcare territory intelligence on live federal data. View ProxiMed
ProxiSchool & ProxiMatch
Pricing
Free
Postal Code Distance Engine
Free to download and keep, and it runs fully offline. No account, no subscription.
Download freeFAQ
Common questions.
How accurate are the distances?
Distances are straight-line between ZIP centroids, which is the right measure for territory and proximity work.
Does it work offline?
Yes. The tool is a single HTML file with the ZIP database built in. Open it in any modern browser, no internet required.
Do I need an API key or account?
No. Nothing to sign up for and nothing to configure. Open the file and go.
Does my data leave my computer?
No. Everything runs locally in your browser. Your account list is never uploaded anywhere.