Okmulgee County Treasurer Vonna Lampkins, right, and staff member Genny Mooney, collects mail from the drop box in front of the courthouse. Residents wishing to make their property tax payments can use the box, which is checked several times during the day.The deadline for the first half of taxes is Friday. The second half of property taxes is due March 31. Payments can be made online or in person at the office on the second floor of the Okmulgee County Courthouse. The treasurer’s office will be open until 4:30 p.m. each day.