CBP data indicates that there are more establishments categorized as retail trade businesses with between one and four employees in 21231 than in any other category.
The following table shows how many real estate, rental and leasing businesses with between one and four employees were in 21231 during the period from 2012 to 2016.
Real estate, rental and leasing businesses with between one and four employees in 21231 (2012-2016)
Year
Total businesses
2012
18
2013
19
2014
22
2015
23
2016
22