CBP data indicates that there are more establishments categorized as retail trade businesses with between one and four employees in 21215 than in any other category.
The following table shows how many information businesses with between one and four employees were in 21215 during the period from 2012 to 2016.
Information businesses with between one and four employees in 21215 (2012-2016)
Year
Total businesses
2012
9
2013
9
2014
8
2015
11
2016
12