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Tax Bill Lookup


New Owners, please note the account ownership information is updated annually with our tax file, starting July 1st, from the State Department of Assessments and Taxation (SDAT). Please use the previous owner's last name or your parcel number to locate your account data. Using your address, you may be able to locate your account via the SDAT website.

Once you have the account number, you may use it to locate a tax bill for the property you have recently purchased.

If you need further assistance please contact the St. Mary's County Treasurer's Office at 301-475-4200 extension *3300

St. Mary's County Public Water and Sewer bills are managed by St. Mary's County Metropolitan Commission (MetCom). In accordance with Chapter 113-14.H of the code of St. Mary's County, unpaid water and sewer bills, service charges, all penalties and late charges are first liens against the property. For more information visit or email MetCom customer service at

MetCom water and sewer accounts are subject to tax sale based on the following legislation and guidelines. St. Mary's County Treasurer's Office includes these accounts in our annual tax sale.

  1. Maryland Annotated Code Section 14-810
  2. St. Mary's County Code of Public Laws Chapter 113