> ## Documentation Index
> Fetch the complete documentation index at: https://docs.countrystatecity.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Subregions by Region

> Retrieve subregions within a geographic region

Retrieve all subregions belonging to a specific region. For example, region "Asia" contains subregions like "Southern Asia", "Eastern Asia", etc.

<Note>**Availability:** Supporter plan and above.</Note>

<Tip>
  **Trim and order results:** Add `?fields=` to limit columns returned, or `?sort=` to order the list. Both are available on **Supporter+** plans. See the [Field Filtering & Sorting](/api/field-filtering-and-sorting) guide for syntax and per-entity sortable fields.
</Tip>

## Authentication

<ParamField header="X-CSCAPI-KEY" type="string" required>
  Your API key for authentication
</ParamField>

## Path Parameters

<ParamField path="id" type="integer" required>
  Numeric region ID (e.g., `3` for Asia)
</ParamField>

## Query Parameters

<ParamField query="q" type="string">
  Search filter on subregion name. Min 2 characters. Requires Supporter+ plan.
</ParamField>

## Response

<ResponseField name="id" type="integer">
  Unique identifier for the subregion
</ResponseField>

<ResponseField name="name" type="string">
  Subregion name
</ResponseField>

<ResponseField name="region_id" type="integer">
  Parent region ID
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl -X GET 'https://api.countrystatecity.in/v1/regions/3/subregions' \
    -H 'X-CSCAPI-KEY: YOUR_API_KEY'
  ```

  ```javascript JavaScript theme={null}
  const response = await fetch('https://api.countrystatecity.in/v1/regions/3/subregions', {
    headers: { 'X-CSCAPI-KEY': 'YOUR_API_KEY' }
  });

  const subregions = await response.json();
  console.log(subregions);
  ```
</RequestExample>

<ResponseExample>
  ```json 200 - Success theme={null}
  [
    { "id": 14, "name": "Southern Asia", "region_id": 3 },
    { "id": 15, "name": "Eastern Asia", "region_id": 3 },
    { "id": 16, "name": "South-Eastern Asia", "region_id": 3 },
    { "id": 17, "name": "Western Asia", "region_id": 3 },
    { "id": 18, "name": "Central Asia", "region_id": 3 }
  ]
  ```
</ResponseExample>