From Harford County government:
The Harford County Department of Treasury is reminding citizens of the semi-annual real estate tax due date. Homeowners that pay their taxes semi-annually are required to submit their taxes by December 31, 2010.
Outstanding balances may be viewed on the Harford County Government website at www.harfordcountymd.gov/payments. Those who have questions after visiting the website should contact the Department of Treasury Revenue Collections Office at 410-638-3269, Monday – Friday during normal business hours.