CBP data indicates that there are more establishments categorized as professional, scientific and technical services businesses with between one and four employees in Maricopa County zip codes than in any other category.
The following table shows how many wholesale trade businesses with between one and four employees were in Maricopa County zip codes during the period from 2012 to 2016.
Wholesale trade businesses with between one and four employees in Maricopa County (2012-2016)
Year
Total businesses
2012
2547
2013
2500
2014
2469
2015
2428
2016
2393