We have a business requirement to show application data on USA zip level map on city drill-down map. we have some queries as follows,
1. Geojson for the states of USA is based on cities or counties? (for example, Georgia - http://code.highcharts.com/mapdata/coun ... l.geo.json)
2. Can geojson for the states of USA can provide zip5/postal numbers for each city?
if we could get zip or at least city info in the geojson's of states of USA we can buy developer license of highcharts-map.