Byrnes Mill, MO

Population
3,183
U.S. Census Population Estimates Program · 2025
Elevation
468 ft
Median Home Value
$306,200
U.S. Census American Community Survey 5-Year · 2024
Median Rent
$1,137/mo
U.S. Census American Community Survey 5-Year · 2024
Median Income
$98,576
U.S. Census American Community Survey 5-Year · 2024
General Quality
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About Byrnes Mill

Tucked along the bends of the Big River in northern Jefferson County, Byrnes Mill is a quiet, scenic community about thirty miles southwest of St. Louis. Home to around 3,000 residents, the town offers a relaxed atmosphere surrounded by wooded hills and winding river roads. The area traces its roots to a 19th-century grist mill founded by Irish settler Patrick Byrnes. Today, Byrnes Mill City Park and the historic mill dam anchor the town, giving residents a favorite spot for fishing, picnicking, and enjoying the river. Route 30 runs right through the area, linking quiet residential pockets to neighboring High Ridge and the wider metro.

Families in Byrnes Mill are served by the Northwest R-1 School District, and local shops along Highway 30 cover day-to-day essentials. For larger grocery runs, big-box stores, and hospital care, residents can easily hop over to nearby Fenton or commute directly into St. Louis. Outdoor recreation is a huge part of the local lifestyle, with easy access to kayaking, fishing, and community events at the park. For buyers seeking a peaceful, woodsy setting with a small-town pace, Byrnes Mill provides a welcoming riverfront retreat within commuting distance of the city.

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