public class UserProfileViewModel
{
    public ApplicationUser userProfile { get; set; }
    public AddressViewModel userAddress { get; set; }
}

public class AddressViewModel
{
    public int ID { get; set; }
    ......
    public virtual List<GeoData> GeoDataList { get; set; }
}

@model MySite.ViewModels.UserProfileViewModel
...
@foreach (var item in Model.userAddress.GeoDataList)
        {
        <dd>
            @Html.DisplayFor(modelitem => item.PlaceName)
        </dd>
    }

@foreach (var item in Model.userAddress.GeoDataList)
        {
            <dd>
                @Html.DisplayFor(modelitem => (item.PlaceName + ", " + item.PostalCode + ", " + item.Latitude + ", " + item.Longitude))
            </dd>
        }

Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.

@foreach (var item in Model.userAddress.GeoDataList)
        {
            <dd>
                @Html.Display(item.PlaceName + ", " + item.PostalCode + ", " + item.Latitude + ", " + item.Longitude)
            </dd>
        }