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

# List geo metros

> Resolve metro targeting codes to display labels

`GET /api/v2/buyer/targeting/geo-metros`

Compatibility shortcut for geo metro code-name pairs. New workflows should prefer [List targeting dimension values](/v2/buyer/campaigns/tasks/list-targeting-dimension-values) with `system=nielsen_dma`, and [Resolve targeting dimension text](/v2/buyer/campaigns/tasks/resolve-targeting-dimension) when the buyer provides a name such as "LA DMA".

The optional `system` query parameter defaults to `nielsen_dma`, which is the only supported geo metro system today.

## Request

```bash theme={null}
curl "https://api.interchange.io/api/v2/buyer/targeting/geo-metros?system=nielsen_dma" \
  -H "Authorization: Bearer $SCOPE3_API_KEY"
```

## Parameters

| Field    | Type | Required | Notes                               |
| -------- | ---- | -------- | ----------------------------------- |
| `system` | enum | No       | Optional; defaults to `nielsen_dma` |

## Response

```json theme={null}
{
  "system": "nielsen_dma",
  "locale": "en-US",
  "entries": [
    { "code": "532", "name": "Albany-Schenectady-Troy" },
    { "code": "803", "name": "Los Angeles" }
  ]
}
```

Send only the numeric string codes in campaign `constraints.geo_metros`. To display labels for a campaign response, request `fields=geo_metro_names` on `list_campaigns` or `get_campaign`; included labels return in `geo_metro_names`, excluded labels return in `geo_metro_names_exclude`, and both are derived from the same local table.

## Related

<CardGroup cols={2}>
  <Card title="Create campaign" href="/v2/buyer/campaigns/tasks/create-campaign" icon="plus">
    Store metro targeting codes
  </Card>

  <Card title="Resolve targeting dimension text" href="/v2/buyer/campaigns/tasks/resolve-targeting-dimension" icon="wand-magic-sparkles">
    Resolve names like LA DMA
  </Card>
</CardGroup>