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To find the median value of these houses, we need to first arrange the values in ascending order:
$150,000, $150,000, $220,000, $220,000, $220,000, $220,000, $490,000, $490,000, $490,000, $540,000, $540,000, $800,000, $800,000, $800,000, $800,000, $800,000, $975,000, $975,000
Since there are 18 values, the median will be the average of the 9th and 10th values, which are both $490,000.
Therefore, the median value of these houses is $490,000.