Office of the County Treasurer
How May We Help You?

The St. Mary's County Treasurer's Office is dedicated to providing excellent customer service to its citizens, while providing timely and accurate financial information to the public and to the St. Mary's County Commissioners.
The primary function and duty of the St. Mary's County Treasurer's Office is the billing and collection of real estate and personal property taxes for the State and County. Other functions include the issuance of motor vehicle registration renewals, liquor licenses, deed transfers, business license renewals, and conducting the annual tax sale auction.
We will be happy to assist you via the telephone, fax or email.
Counter hours are Monday through Friday 8:00 a.m. to 4:30 p.m. The office is closed on all County recognized holidays.
County Treasurer
Christine L. Kelly
Christy.Kelly@stmarysmd.com
(301) 475-4200 ext 3300
Physical Address
Patuxent Building
23150 Leonard Hall Drive
Leonardtown, MD 20650
Mailing Address
P.O. Box 642
Leonardtown, MD 20650
Taxes - Real Property
- Tax Bills
- 6 Month New Construction
- Address Change
- Assessments
- Bill Due Dates
- Real Estate Tax Rate Table
- Annual Tax Sale Auction
- Tax Year
- Bay Restoration Fund (BRF)
- Environmental and Solid Waste (ESW)
Taxes - Personal Property
- What is Maryland's Personal Property Tax
- Personal Property Tax Rate Table
- Address Change
- Business License Information
- Start a Business in St. Mary's County
- Annual Return Filing/Amendment Instructions
- Close a Business
- Forfeited Business Status
- Tax Clearance Certificates
- DUE DATE
- FAS-115
- Maryland Business Express for Corporations and Sole Proprietors
Tax Credit Programs and Exemptions
- What Senior Tax Credit Is Right For You?
-
St. Mary's County Consolidated Senior Tax Credit Application
- County Senior "Cap" Tax Credit
- County Senior "65-10" Tax Credit
- County Senior "Matching" Tax Credit
- Maryland Homeowners' Tax Credit
- Maryland Homestead Credit
- Maryland Veteran's Exemption
- Maryland Blind Persons Exemption