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Centroid, distance and smaller radius distance files are available for the following years for easier access. Each link has a the full distance file in csv, dta, and sas format, as well as folder containing similar files centroid data and 5, 25, 100, and 500 mile radius.
I'd simply just create a zip_code_distances table and pre-compute the distances between all 42K zipcodes in the US which are within a 20-25 mile radius of each other. create table zip_code_distances ( from_zip_code mediumint not null, to_zip_code mediumint not null, distance decimal(6,2) default 0.0, primary key (from_zip_code, to_zip_code ...
City Distance Database - Place Distance Database. City Distances are great-circle distances calculated using the Haversine formula based on internal points in the geographic area. Places are from Census 2000 SF1 and Census 2010 SF1 files.
Our Free ZIP Code Database is set of all U.S. ZIP code data put into row and column format for easy use and manipulation. The free version comes with 7 data fields for every ZIP code in the United States. It has all the basic information you need to validate ZIP Code entry and basic mapping.
Search ZIP codes by multiple geographies, includ-ing state, county, city & across time zones. Also included are functions for relating ZIP codes to Census data, geocoding & distance calculations. License GPL-3. URL https://github.com/gavinrozzi/zipcodeR/, https://www.gavinrozzi.com/project/zipcoder/.
Calculate the distance between two U.S. or Canadian ZIP codes. Distance Calculator from ZIP Code; Distance Calculator to ZIP Code
Calculate the distance between two ZIP codes to show your users the distance (road distance or as the crow flies) to the nearest store or dealer. It allows your website's visitors to find the nearest dealers to their home by entering their own ZIP code.
