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Research your Baltimore rowhouse history for free

Start with one block and one question. This route combines free historical maps with public research guides, so you can keep track of what is documented and what is still a guess.

By the PlaceLayers editorial team · Sources checked 30 September 2026

Have 20 minutes? Write down your cross streets, open a historical map, and save one dated observation with its source. You do not need to solve the whole history in one visit.

1. Define the question

“What stood on this block?” and “Who owned my house?” require different evidence. Choose one first. Record the current address, nearby cross streets and a landmark. Keep notes about private residents out of anything you share publicly.

2. Locate the block before the house

Start with Baltimore’s map collection or the then-and-now overlay. A regional topographic map is useful for streets, terrain and the harbor. A detailed insurance atlas can help with building outlines and recorded uses. Do not expect the two to answer the same questions.

3. Follow the atlas index

Choose an edition, open its index, find your street and cross streets, and note the printed plate number. The viewer’s image position may include covers and index pages, so it is not necessarily the same number. Follow the original archive link if the embedded viewer does not load. Confirm the year and coverage before interpreting an apparent absence.

4. Try a real example: Broadway and Aliceanna

Use Aliceanna Street and S Broadway to orient yourself around the market. The market operator lists Broadway Market at 1640 Aliceanna Street. Record that as a present-day location reference, then locate the intersection in the atlas. Do not assume the landmark’s founding date is the age of every structure on the block.

For a different date check, visit Thames Street: Recreation Pier’s documented 1914 opening is later than the two Sanborn years listed in our current collection. An older map can provide context, but it cannot document a building’s later opening.

5. Add a second kind of evidence

The Enoch Pratt Free Library house-history guide explains how assessment records, deeds, maps and newspapers can help. It links to Maryland’s property search and land-record services; some resources require registration or a library card. Free online coverage is not the same as a complete record, and copies or specialist research may have costs.

Choose a second source for the question you wrote down. A map observation, a directory entry and a deed are different kinds of evidence. If they disagree, preserve both entries rather than selecting the one that makes a tidier story.

6. Keep a small evidence log

Field	What to save
Question	The specific fact you are trying to establish.
Source	Archive link, document title, year and printed plate or page.
Observation	What you can actually read or see, without filling gaps.
Confidence	Confirmed by another source, tentative match, or unresolved.
Next step	The one record that might settle the remaining question.

Common traps

An empty-looking area is not proof of an empty lot. Check scale, coverage and legibility.
A map date is not automatically a construction date. Maps show a recorded state; they may simplify or omit details.
A matching number is not enough. Compare intersections and block geometry when addresses differ.
A historical use is not a present-day property assessment. This guide does not assess environmental condition or ownership rights.

Choose your first street

S Broadway Thames Street Aliceanna Street

Sources and further research

This is a self-guided research workflow. It does not promise that every record is online or that a particular house can be dated conclusively.