Los Angeles County is home to more than 10.4 million residents, more than a quarter of California’s population.  As the state’s most populace county, it follows that the number of its citizens who need County services, such as mental health interventions, immunizations and child welfare assistance, are in the tens of thousands. How can a small change or new program make a noticeable impact in such a vast infrastructure? How can you communicate effectively when you are trying to reach so many? Three programs in Los Angeles County demonstrate how and do so in a way that, no matter the size of county, can be replicated with success.