What are principal business activity codes for Taxi Cab Drivers & Independent Contractor?

[Marketstar]

Try 485300.

[Marketstar]

There is no code for independent contractor-only for specific lines of work such as taxi driver

[RCA]

Then, I imagine that the Code to use is the "Catchall" 999999?

[Critter]

https://taxmap.irs.gov/taxmap2016/instr/i1040sc-016.htm