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Survey Control Map Service

Browser Requirements

  • Internet Explorer -Version 5.0, 5.5, 6.0 or higher
  • Netscape -4.61, 4.75, 6.0 or higher
  • Mozilla - 5.0
  • AOL browser may experience errors

Connection and System Requirements

  • Broadband connection will work for 56k or higher connections
  • Supported Macintosh systems 9.0 or higher

User Terms and Conditions Summary

Baltimore County adopted the Maryland Coordinate System, North America Datum of 1983 (1991) and the North America Datum of 1988 as it's standard horizontal and vertical datum starting July 1, 1999. Prior to this date Baltimore County Metropolitan District grid system (horizontal) and Baltimore County Datum (vertical) were used for thousand 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 County code, policy and with appropriate agencies to verify the correct datum(s) to be used on current and future projects requiring Baltimore County approvals.

New users should "Read More" to review the full User Terms and conditions. Current users can login or update registration if their information has changed.

Questions? Call us at 410-887-3540, or send an e-mail to

Revised March 15, 2012

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