getzips.js

var request = require("request");

var first = 10001;
var last = 99999;
var current = first;

var zips = {};

var convertZip = (function convertZip() {
    if ( current < last ) {

        var url = "http://maps.googleapis.com/maps/api/geocode/json?address=" + current + "+usa&sensor=false";

        request( url, function( error, response, body ) {
            var content = JSON.parse( body );

            if ( content.results[0] ) {
                if ( content.results[0].address_components[0].types[0] === "postal_code" ) {
                    var coords = content.results[0].geometry.location;

                    var lat = coords.lat;
                    var lng = coords.lng;

                    console.log( current + " " + lat + " " + lng );

                    zips[current] = { lat: lat, lng: lng } ;
                } else {
                    //console.log( content );
                }
            }

            current++; convertZip();
        });
    } else {

    }
})();