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The Maryland Inventory of Historic Properties (MIHP)

The Maryland Inventory of Historic Properties (MIHP) is a repository of information on districts, sites, buildings, structures, and objects of known or potential value to the prehistory and history of the State of Maryland. The Inventory was created shortly after the Maryland Historical Trust was founded in 1961, and now includes data on more than 13,000 archaeological sites and 43,000 historic and architectural resources. The MIHP includes information about both standing structures and archaeological resources. Inventoried properties contribute information to our understanding of Maryland’s architecture, engineering, archaeology, or culture.

Note: The MIHP is solely an instrument for research and documentation: Inclusion in the Maryland Inventory of Historic Properties involves no regulatory restrictions or controls. Maryland state law provides mechanisms – separate from the MIHP – giving both the State and local jurisdictions the authority to regulate appropriately designated historic resources.

Placing a Property on the MIHP

1. Request a MIHP Number

Inventory numbers are assigned only in coordination with the MHT. Local jurisdictions cannot assign numbers. The formal request should be made in writing and should include the names and addresses of all properties with the sites clearly located on a 7.5-minute United States Geological Survey (USGS) topographic quadrangle map (1:24,000-scale).

Please indicate the location of the property on the 1:24,000 map and ALSO include a zoomed-in view of the map with the exact boundary clearly marked.

This may be e-mailed to the Inventory Registrar. If an inventory number has not already been assigned, please contact the Inventory Registrar, Mary Kate Mansius, for assistance by e-mail at or by telephone at (410) 697-9570.

2. Download and Fill Out the MIHP Form

Download the MIHP form as a fillable Microsoft Word document at the link below:

» Microsoft Word Document
» Instructions for Using the MS Word Document Template

Prior to completing a MIHP form, please thoroughly read Chapter IV in the Standards and Guidelines for Architectural and Historical Investigations in Maryland, available at the link below:

» Standards and Guidelines for Architectural and Historical Investigations in Maryland.

If clarification on the form’s requirements or content is needed, please email Heather Barrett, Administrator, Research & Survey, at or call at 410-697-9536. If you are submitting more than a single form, please notify Ms. Barrett about the scope of work prior to commencing the project.

Submit the Form to MHT

Make sure the information is filled out completely. Some common problems and/or items to check before submitting are in the checklist below:

» Final Checklist for MIHP Form Completion

Partial or incomplete forms will not be reviewed. The completed MIHP form and all accompanying documentation should be submitted directly to Ms. Barrett. Please note that both an electronic (Word or fillable PDF) and a hard copy are required.

Mail the completed form with capsule summary, all appropriate photos, and maps to:

Heather Barrett
Office of Research, Survey, and Registration
Maryland Historical Trust
100 Community Place, 3rd Floor
Crownsville, MD 21032

Who Can Submit MIHP Forms?

Charles Carroll House, Annapolis

While anyone may submit information about a property for inclusion in the Maryland Inventory of Historic Properties, the information must meet specific guidelines and standards linked below, or it will be returned for editing and further documentation. All grant-funded survey and documentation projects, including comprehensive county-wide surveys, and individual site research projects, as well as regulatory compliance projects must submit information to MHT in a format that is consistent with the standards described below.

Before completing or submitting a Maryland Inventory of Historic Properties form, please contact the MHT’s Administrator of Research and Survey, Heather Barrett at (410) 697-9536 for assistance and information.

Standards & Guidelines for Survey Data

The Maryland Inventory of Historic Properties is built upon documentation gathered through on-site description and analysis of structures and other resources. The MIHP form is based on the National Register of Historic Places form and requires thorough narrative description detailing a resource’s physical integrity, condition and its place in Maryland’s history. This written analysis is supported by photographs and cartographic information, and forms often include floor and site plans to scale.

All survey data must conform to the Standards and Guidelines for Architectural and Historical Investigations in Maryland (2019) to ensure high quality research and the archival nature of submissions to the MIHP.

Digital Forms and Photographs

The 2019 Standards and Guidelines for Historical Investigations in Maryland, Appendix B incorporates a revised set of Standards for Submission of Digital Images to the Maryland Inventory of Historic Properties. This update addresses the requirement for shooting and printing archival digital images and for submitting electronic versions of the MIHP form.

Note: Digital photographs submitted to the MIHP are held to a 75-year archival standard which requires uncompressed TIF images shot at 300 dpi to create a 5 x 7 image with a minimum resolution of 3000 x 2000.