When in doubt check the guidelines
https://bsaaml.ffiec.gov/manual/Appendices/11Low
The bank is not located in a High Intensity Drug Trafficking Area (HIDTA) 305 or High Intensity Financial Crime Area (HIFCA). No fund transfers or account relationships involve HIDTAs or HIFCAs.
Medium
The bank is located in an HIDTA or an HIFCA. Bank has some fund transfers or account relationships that involve HIDTAs or HIFCAs.
High
Bank is located in an HIDTA and an HIFCA. A large number of fund transfers or account relationships involve HIDTAs or HIFCAs.
While the exact number of customers in HIDTA is not required (It would be good to have that data), you would need to know about the HIDTA/HIFCA location for funds transfer transactions based upon above.