CBP data indicates that there are more establishments categorized as professional, scientific and technical services businesses with between one and four employees in 21403 than in any other category.
The following table shows how many construction businesses with between one and four employees were in 21403 during the period from 2012 to 2016.
Construction businesses with between one and four employees in 21403 (2012-2016)
Year
Total businesses
2012
54
2013
50
2014
52
2015
50
2016
44