While the specific Census-Designated Place (CDP) of Lusby has a population of approximately 9,600 (as of the 2020 Census), the broader Lusby community spanning the 20657 ZIP code is home to over 25,000 residents, making it the most heavily populated area in Calvert County.
The population has grown steadily over the last several decades, driven by the expansion of the nearby Patuxent River Naval Air Station and the local energy sector. The demographic makeup is predominantly White, with a significant African American population and a growing Hispanic community.
Lusby boasts a high median household income, largely due to the prevalence of technical, engineering, and defense-related jobs in the surrounding region. The community features a mix of young families, active-duty military personnel, and retirees drawn to the waterfront lifestyle.