Jian'an District Postal codes
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Free JSON for Jian'an District.
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https://api.listpostcode.com/v1/countries/CN/resolve?path=/henan/xuchang-shi/jianan-districtcurl -H "x-api-key: YOUR_API_KEY" \
"https://api.listpostcode.com/v1/countries/CN/resolve?path=/henan/xuchang-shi/jianan-district"