 <p>If you want a composite object try something like</p> <pre><code>$results = (Invoke-RestMethod -URI "http://www.broadbandmap.gov/broadbandmap/broadband/dec2013/wireline?latitude=29.488412&amp;longitude=-98.550208&amp;format=json") $obj = $results.Results.wirelineServices $obj | add-member -type noteproperty -Name StateFips -Value $($results.Results.broadbandSource.stateFips) -PassThru $obj | convertto-xml -as string </code></pre>