Courtesy of Citybizlist – Maryland lays claim to five of America’s 15 richest counties, led by Howard County with a median household income of $101,771, according to a report by The Street.

The Street looked at Census Bureau data from 2010, selecting the 15 counties with the highest median household income – boasting a combined median income nearly double the national average of $49,445.

American’s richest county is Loudon County, Va., with a $119,540 median income.

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Here is what The Street said about the five counties in Maryland that made the list.

3rd Richest: Howard County, Md.

Median Household Income: $101,771

With an astounding 58.3% of residents holding a bachelor’s degree or higher, Howard County shows that higher education can pay. One of only three counties that have a six-figure median household income in the U.S., Howard is located between Baltimore and Washington, D.C., attracting the extremely affluent. The median value of owner-occupied homes in the county is $456,200.

12th Richest: Montgomery County, Md.

Median Household Income: $89,155

With almost 1 million residents, Montgomery is one of the largest counties on our list. It’s no surprise that this county is so large, since it’s situated just north of Washington, D.C. and only an hour from Baltimore.

More than half of the county’s population has a bachelor’s degree or higher and the home values in this area are astounding. The median value of owner-occupied homes was $482,900 from 2006-2010.

13th Richest: Calvert County, Md.

Median Household Income: $88,862

Calvert lies just across the Patuxent River from St. Mary’s County, which holds the 14th spot on our list. The median household income in this county didn’t see the same boom that St. Mary’s saw year over year, though. Its income remained essentially flat, decreasing less than 1% from 2009.

Veterans make up roughly 10% of the population, according to the most recent census data.

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