The Baltimore Business Journal released a report this month on the top 50 wealthiest zip codes in the Baltimore area and nine of the top 10 are in Howard County. The report uses data from Esri, a California-based geographic mapping and data company, according to BBJ.
The article listed the wealthiest zip codes in this order:
1. Dayton - 21036 2. West Friendship - 21794 3. Glenelg - 21737 4. Cooksville - 21723 5. Fulton - 20759 6. Glenwood - 21738 7. Clarksville - 21029 8. Highland - 20777 9. Phoenix - 21131 - Baltimore County (Only non-Howard County community in top 10) 10. Ellicott City - 21042
However, comparing the rankings to the median household income found in census data, gathered from the averages of 2007 to 2011 American Community surveys, the results are different:
The Baltimore Business Journal reports it examined median household income and the following factors to determine its ranking: Average net worth, per capital income, disposable income, home values, population counts and household sizes.