This document summarizes a project that integrated community volunteers and health extension workers in Ethiopia to increase the scale and sustainability of polio vaccination efforts. It describes how the project partnered with local organizations to train over 1,000 community volunteers across 54 districts. These volunteers conducted nearly 16,000 house-to-house visits annually to reach over 2 million children. The document compares the volunteers to health extension workers and describes how the project strengthened relationships between the two groups to improve supervision, motivation, and collaboration between volunteers and the formal healthcare system. Evaluation of the partnership found it extended vaccination services and coverage through the combined roles of volunteers and health workers.