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The Land Surveys Division provides services to various County departments—which include mapping, property surveys, stakeout, utility recovery, right-of-way and easement delineation—as well as data for private projects, by maintaining a countywide Control System, with information available upon request.

Survey Control Map Service

Baltimore County provides online access to the County's geographic information system (GIS) databases. The Survey Control application is an interactive map that allows you to access specific information about Baltimore County Control points, as well as the ability to:

  • Find survey controls
  • Provide more information about survey controls
  • Submit conditional information about survey control

Using the Application

Review the Survey Control User Guide for a tutorial on the application. You don't need to create an account to search for survey control in Baltimore County. Users are encouraged to send survey control status updates and pictures to the email address provided in the user guide.

  • Pop-up blockers must be disabled for Survey Control to function properly. Refer to your browser's support on how to check and update this feature.
  • High-speed internet connections are recommended for best results.
  • For optimal performance, use the latest version of Chrome, Edge, Firefox and Safari.

By selecting the below button, you are agreeing to the user terms and conditions outlined below.


Terms and Conditions Summary

Baltimore County adopted the Maryland Coordinate System, North America Datum of 1983 and the North America Datum of 1988 as its standard horizontal and vertical datums starting July 1, 1999. Prior to this date the Baltimore County Metropolitan District grid system (horizontal) and Baltimore County Datum (vertical) were used for thousands of plats and surveys throughout Baltimore County.

Both systems of survey controls are being made available from this site to assist users with all surveys performed in Baltimore County. Users of this data must check the current County Code, policies and appropriate agencies to verify the correct datums to be used on current and future projects requiring Baltimore County approvals.

Warranty and Disclaimer

The user or recipient of this data understands and acknowledges this data may be inaccurate or contain errors or omissions and the user or recipient assumes full responsibility for any risks or damages resulting from, arising from or in connection with any use of or reliance upon data displayed herein.  Baltimore County, Maryland does not warrant the accuracy or reliability of the data displayed herein.  Baltimore County, Maryland disclaims all warranties with regard to data displayed herein, including but not limited to, all warranties, express or implied, of merchantability and fitness for any particular purpose. 

Baltimore County, Maryland additionally disclaims all obligation and liability for damages, including but not limited to, actual, special, indirect, and consequential damages, attorneys' and experts' fees, and court costs incurred as a result of, arising from or in connection with the use of or reliance upon the data displayed herein.

The user or recipient hereby waives the right to file suit or make demand and forever discharges and releases Baltimore County, Maryland, its agents, employees, successors and assigns from any and all loss, liability, damage, claim, cost or expense incurred as a result of, or arising out of or in connection with the use of data displayed herein or any reliance thereon, whether caused by the acts or omissions of Baltimore County, Maryland, its agents, employees, successors or assigns, directly or indirectly.   

The user or recipient of data, hereby acknowledges that Baltimore County, Maryland, its agents, employees, successors, and assigns shall not be responsible for any and all property damage or bodily injury (including serious physical injury or even death) incurred as a result of, or arising out of or in connection with the use of or reliance upon data displayed herein.

The user or recipient hereby agrees to indemnify, protect and hold harmless Baltimore County, Maryland, its officers, agents, employees, successors and assigns from and against any and all suits, demands, losses, liability, damages, claims, costs or expenses incurred by Baltimore County as a result of, or arising out of or in connection with, the user or recipients misuse or misrepresentation of this data.

The user or recipient of the data displayed herein acknowledges and agrees to attach the appropriate notation(s) from the State of Maryland, State board for Professional Land Surveyors, Local Jurisdiction, or any other agency which requires source data information to be identified on a survey.

Understanding the Data

Learn more about how to translate the data below.

Find an Existing County Control Near You

Look online via Survey Control, or fax/email a map showing your site to and we will check our records for the appropriate data. We will fax or email the information back to you, or you can come to our office to pick-up the data. We will not read survey control data over the phone.

Find Current Continuously Operating Reference (CORS) Information

The Baltimore County CORS, known as BACO, is part of the National CORS network.

  • For five-second epoch data—Visit the National Geodetic Survey CORS website and type "BACO" into the Enter Site ID box.
  • For one-second data—Call 410-887-3540. The Land Survey Division maintains one second epoch data for a period of 60 days.

About County Surveyors

Baltimore County surveyors will give you a letter explaining their presence. If surveyors are from a private surveying firm, you will need to ask them directly. Baltimore County does not regulate the many surveying companies operating in the County. Baltimore County surveyors do not preform surveys for private citizens. 

Submit a Complaint 

The Maryland Department of Labor, Licensing and Regulation will investigate complaints and take any appropriate action.

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Contact Us

Land Surveys

111 West Chesapeake Avenue
Room 300A
Towson, Maryland 21204


Monday through Friday
8 a.m. to 4:30 p.m.






Patrick A. Simon, L.S.