There were 12 utilities in Pima County zip codes that had between one and four employees in 2016, according to County Business Patterns (CBP) statistics provided by the United States Census Bureau.

CBP data indicates that there are more establishments categorized as professional, scientific and technical services businesses with between one and four employees in Pima County zip codes than in any other category.

The following table shows how many utilities with between one and four employees were in Pima County zip codes during the period from 2012 to 2016.