In the summer of 2020, data storyteller Andy Krackov and epidemiologist Sarah Marikos worked closely with a number of coalitions in the COPN network to help them find, analyze, and communicate local data related to substance use. Based on this experience, Sarah and Andy, along with CHLP staff, developed a comprehensive COPN Measurement Guide. This guide offers practical advice on leveraging data through use cases, worksheets, and includes links to numerous resources. During part I of this two-part series, Sarah and Andy will share lessons learned in data storytelling and unveil the COPN Measurement Guide that any coalition in California can use for their work.