These are descriptions of various historic map collections online.
For links to specific maps, see also Historic maps and Thematic maps.

Guides to house number and streetname changes
from the Chicago History Museum

Guide to 1909 house number changes outside downtown (170MB PDF)
Guide to 1911 house number changes downtown (47MB PDF)
Guide to streetname changes (small PDF)


The online Encyclopedia of Chicago
includes maps from the published book and other maps
from the Chicago History Museum

University of Chicago map library
online digital collection

Historic USGS topo viewer
Uses ESRI online viewer: double-click rather than scroll to zoom in

Historic USGS topo viewer
A different, easy-to-use interface to access most Chicago-area maps

David Rumsey map collection
enormous online collection of historic maps

Library of Congress Images of America
primarily 19th century birds-eye views

Harvard University map library
online digital collection

University of Alabama
collection of national atlas maps of Chicago

NOAA Coast Survey historic charts
collection of coastal charts, including the Lake Michigan coastline

University of Wisconsin–Milwaukee
historic maps of Chicago

Indiana historic maps at IUPUI
historic maps of Chicago

Texas A&M University
1902 Geologic Atlas folio of Chicago area
topo maps on pages 15-18

Chicago Public Library
Sanborns Fire Insurance Maps online
click here for a guide to volume numbers

Historic Chicago transit maps

Smoke Abatement maps of Chicago railroads & industry
download full 1915 report (1177 pages) in PDF format from
download 151 map pages only in PDF format

Chicago Land Use Survey
Vol. I: Residential Chicago
Vol. II: Land Use in Chicago
full 1942 reports in PDF format from

Aerial photos of Cook County 1938
choose location from an online map and download

Historic aerial photos

Original surveyors maps and notes for Cook County
prior to land sales and extensive European settlement