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Download Region and City Manager 4.0.1 / 7.0.0 version 7.0.0 from nullpro website.
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Region and City Manager 4.0.1 / 7.0.0 have
City and Region Manager allows you to add states/regions, cities and zip codes/postcodes for all countries. Regions,cities and zip codes will be displayed as dropdowns list in all address forms on fronted like checkout billing address step, checkout shipping address step and customer address, hence customers can select state,city and zip code by dropdown.