Area Pin Code Search - India

I want to create a WordPress plugin for a Pin Code Search feature. I already have the pin code data in an Excel sheet with columns in this exact order:

State_Name, Region_Name, State_Circle, Division_Name, District, City/Village/Block, Pin_Code, Indian_Postal_Delivery, Latitude, Longitude

The plugin should have two main components: a frontend search form and a backend data upload interface.

Frontend Features:
A search interface with the following:

Option 1 (Dropdown-based search):

First dropdown: State_Name

Second dropdown (auto-populated based on first): District