combine.js

var urls = ['7300000-7399999.json', '1000000-1099999.json', '3400000-3499999.json', '5700000-5799999.json', '5800000-5899999.json', '6500000-6599999.json', '4100000-4199999.json', '2200000-2299999.json', '1800000-1899999.json', '2500000-2599999.json', '4600000-4699999.json', '6200000-6299999.json', '5000000-5099999.json', '3300000-3399999.json', '1700000-1799999.json', '7400000-7499999.json', '4900000-4999999.json', '1900000-1999999.json', '2400000-2499999.json', '4700000-4799999.json', '6300000-6399999.json', '900000-999999.json', '5100000-5199999.json', '3200000-3299999.json', '800000-899999.json', '1600000-1699999.json', '7500000-7599999.json', '4800000-4899999.json', '7200000-7299999.json', '1100000-1199999.json', '100000-199999.json', '3500000-3599999.json', '5600000-5699999.json', '5900000-5999999.json', '6400000-6499999.json', '300000-399999.json', '200000-299999.json', '4000000-4099999.json', '2300000-2399999.json', '6100000-6199999.json', '4500000-4599999.json', '2600000-2699999.json', '2900000-2999999.json', '1400000-1499999.json', '3000000-3099999.json', '5300000-5399999.json', '6900000-6999999.json', '5400000-5499999.json', '3700000-3799999.json', '0-99999.json', '1300000-1399999.json', '7000000-7099999.json', '2100000-2199999.json', '4200000-4299999.json', '6600000-6699999.json', '3800000-3899999.json', '6800000-6899999.json', '5500000-5599999.json', '3600000-3699999.json', '1200000-1299999.json', '7100000-7199999.json', '2000000-2099999.json', '4300000-4399999.json', '6700000-6799999.json', '3900000-3999999.json', '6000000-6099999.json', '600000-699999.json', '7700000-7709981.json', '4400000-4499999.json', '2700000-2799999.json', '700000-799999.json', '400000-499999.json', '2800000-2899999.json', '7600000-7699999.json', '1500000-1599999.json', '500000-599999.json', '3100000-3199999.json', '5200000-5299999.json'];

var deferreds = [];
$.each(urls, function (index, url) {
  deferreds.push($.getJSON(url)); 
});

$.when.apply($, deferreds).then(function () { 
  var data = [];
  $.each(arguments, function (index, chunk) {
    data = data.concat(chunk);
  });
  start(data); 
});