Research Services

Unlocking the Stories Within the Maps

Every historical map is a primary source document packed with information about the people, places, and decisions that shaped Chicago. But extracting that information requires more than a casual glance. It takes expertise in cartographic conventions, knowledge of the publishers and surveyors who created these documents, familiarity with the archival landscape, and the patience to cross-reference multiple sources until a coherent narrative emerges. At Earliest Chicago Maps, our research services give you access to all of these capabilities, whether you need to answer a single focused question or conduct a comprehensive investigation spanning decades of the city's mapped history.

Our research team is led by Dr. Catherine Aldrich, our founder and a published scholar of Chicago's cartographic heritage. Dr. Aldrich has spent over twenty years studying how maps recorded and influenced the city's development, from the earliest French exploration routes through the explosive growth of the railroad era, the devastation and rebuilding after the Great Fire, the progressive urban planning movement that produced the Burnham Plan, and the neighborhood transformations of the twentieth century. Her deep familiarity with the documentary record means that our team knows exactly where to look for the evidence our clients need, and how to interpret it in its proper historical context.

Types of Research We Offer

Property History Research: If you own property in Chicago and want to understand its history, maps are among the most revealing sources available. We trace your lot through sequential editions of plat maps, Sanborn fire insurance maps, bird's-eye views, and atlas plates to document changes in ownership, building footprint, land use, and neighborhood character over time. Property history reports are popular with homeowners restoring vintage buildings, developers seeking historical context for adaptive reuse projects, and attorneys needing evidence for zoning or boundary disputes.

Genealogical Map Research: Historical maps can place your ancestors in specific locations at specific moments in Chicago's history. By combining census records with contemporary maps, we can show exactly where your great-grandparents lived, what their neighborhood looked like, which businesses and institutions surrounded them, and how the area changed during their lifetime. These visual narratives bring genealogical research to life in a way that names and dates alone cannot.

Academic and Thesis Support: Graduate students, doctoral candidates, and faculty researchers working on topics related to Chicago's urban development, architectural history, transportation infrastructure, demographic patterns, and environmental change frequently need access to cartographic primary sources and expert guidance on their interpretation. We offer structured research consultations, source identification assistance, high-resolution reproductions for publication, and review of cartographic analysis within academic manuscripts. Discounted rates are available for qualifying students and faculty.

Documentary and Publication Research: Filmmakers, authors, journalists, and exhibition curators working on projects about Chicago history rely on our archive and expertise to locate specific maps, provide contextual background, and supply publication-ready reproductions. We have contributed research and source materials to several award-winning documentary films, museum exhibitions, and published books about the city's history.

Legal and Boundary Research: Historical maps are frequently introduced as evidence in property disputes, easement questions, environmental liability cases, and zoning appeals. Our researchers prepare detailed cartographic analyses and expert summaries suitable for legal proceedings, and our team members are available to provide expert testimony when required. We work with attorneys, title companies, and municipal agencies to deliver the historical cartographic evidence needed to resolve complex land-use questions.

Our Research Process

1. Scoping consultation: We discuss your research question, objectives, and timeline in a free initial meeting. We assess what is likely to be found, identify the most relevant archival sources, and provide a written estimate of time and cost.
2. Source identification: We search our in-house library and partner archives to locate the maps, atlases, and supplementary documents most relevant to your question.
3. Analysis and interpretation: Our historians examine the identified sources, extract relevant data, and build a coherent narrative that addresses your research question with appropriate scholarly rigor.
4. Reporting: We deliver a written research report with annotated maps, source citations, and contextual narrative. Reports can be tailored to academic, legal, or general-audience standards depending on your intended use.
5. Follow-up: We remain available for questions, additional research, and consultation as your project evolves.

Our Archival Resources

Our in-house library contains over 1,200 cataloged Chicago maps, atlases, plat books, and fire insurance maps spanning from the 1670s to the 1960s. We maintain institutional research partnerships with the Newberry Library, the Chicago History Museum, the Illinois State Archives, and the Library of Congress Geography and Map Division. These partnerships give us access to collections that are not available to the general public without special permission, and they allow us to cross-reference our findings against the most authoritative holdings in the field.

Clients interested in complementary services often pair research with authentication and appraisal for documents discovered during the investigation, or commission reproduction prints of the most significant maps uncovered in the research process. Our Chicago Timeline Explorer tool is also a useful starting point for understanding the broader historical context of your research question.