A couple of weeks after Money magazine named Rockville the best place to live in Maryland, the city and surrounding communities were ranked the 18th richest suburb in the country by the website Business Insider.

In a post published Tuesday, the website said it based its rankings on the median household income of individual ZIP codes that were included in the U.S. Census’s 2012-2016 five-year American Community Survey. The website noted that “the maximum income the American Community Survey will release is $250,001, so any community that lists its median income as $250,001 may be higher.”

According to Business Insider, Rockville has a median household income of $198,651 and a median housing price of $900,000 for an area with a population of nearly 50,000 that includes parts of Potomac, Rockville, Darnestown and Travilah.

The inclusion of part of the affluent community of Potomac may account for the Rockville area’s ranking on a list that includes such wealthy suburbs as the Connecticut towns of Darien (No. 13) and Weston (No. 7) as well as No. 2 Short Hills, New Jersey. The No. 1 richest suburb is Ross, California, with a median housing price of $2.74 million and a population of 1,314.

According to census data, the median household income for Rockville/North Bethesda alone is just under $102,000 and the median housing price is about $500,000.