The number of health centers serving patients that live in a particular ZCTA refers to the number of HCP awardees and look-alikes that people who live in a ZCTA travel to for services, not how many locations are physically located in a ZCTA. Keep in mind that within this tool there is no easy way to verify which health centers are serving that ZCTA beyond the five with the largest share of health center patients in that ZCTA or which sites the patients are going to.