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To find the median value, we first need to arrange the values in order from least to greatest:
$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
There are 18 values in total, so the median is the average of the 9th and 10th values, which are $490,000 and $540,000.
Therefore, the median value of these houses is ($490,000 + $540,000) / 2 = $515,000.