The Fayette County Board of Elections reports the deadline to vote in the March primary is February 18th. They'll offer extended hours of 8:30am to 9pm that day, at 135 South Main Street in Washington CH.
You must be a current resident of the county, age 18 or older, and a US citizen.
Early voting begins February 19th.
Visit their website at boe.ohio.gov/fayette for a list of registration locations, voter qualifications, and more - or call (740) 335-1190 weekdays 8:30am to 4pm.