Mason
City · Warren County, Ohio
- Established
- 1815
Village was platted as Palmira/Palmyra.
Source · Checked 2026-10-14 - Incorporated as a village
- March 22, 1840Source · Checked 2026-10-14
- Became a city
- 1971Source · Checked 2026-10-14
- Land area (square miles)
- 19.26 2020Source · Checked 2026-10-14
- Census population
- 34,792 2020 Census, April 1Source · Checked 2026-10-14
- Population estimate
- 35,834 July 1, 2025, Vintage 2025
Estimate, not a census count
Source · Checked 2026-10-14 - Principal government building
- Mason Municipal Center, 6000 Mason-Montgomery Road, Mason, OH 45040Source · Checked 2026-10-14
- Government phone
- 513-229-8500Source · Checked 2026-10-14
- Office hours
- Monday–Friday 8:00 a.m.–4:30 p.m.; weekends closedSource · Checked 2026-10-14
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Government directory checked 2026-09-23; individual facts carry their own source and check date.