Background: Radon is a leading cause of lung cancer, but few test their homes to determine radon levels. Purpose: The study assessed feasibility and success of a Test and Win Contest to promote radon testing in rural and urban communities. Methods: The prospective, quasi-experimental study tested a novel contest to raise radon awareness. Paid and earned media recruited homeowners who received a free test kit and were eligible to win free home mitigation. Urban homeowners with the 5 highest radon levels and rural participants with the 3 highest won free radon mitigation systems. Cross-sectional surveys were completed via Internet or phone at enrollment. Results: Most returned the radon test kits (71% urban; 86% rural). Participation was more prevalent in the rural location most likely due to longer media recruitment (6 weeks vs. 11 days) and more money spent on media advertising ($1.86 vs. $0.21 per eligible household). The contest attracted 102 per 10,000 households to test for radon in the rural area compared to 19 per 10,000 households in urban counties. Discussion: The contest was a feasible and successful population-based strategy in both locations. Translation to Health Education Practice: The Test and Win Contest is a promising health education strategy to promote radon testing.