Illinois State Library

County Highway Maps and County Traffic Maps

The checklists provided below detail the Illinois State Library’s (ISL) holdings of two types of the Illinois Department of Transportation’s (IDOT, or its predecessors) maps: 1) the general county highway maps and 2) the county traffic maps. Both types of county maps are issued at two scales: 1 inch = 1 mile and 1 inch = 2 miles. Therefore, each Illinois county has four different charts in the checklists:

• hgh 1 mi (general county highway map, 1 inch = 1 mile)
• hgh 2 mi (general county highway map, 1 inch = 2 miles)
• trf 1mi (county traffic map, 1 inch = 1 mile)
• trf 2 mi (county traffic map, 1 inch = 2 miles)

These checklists indicate ISL holdings only, not necessarily all that was issued. Additionally, duplicate copies and physical format (paper or mylar) are not indicated. Photocopies can be produced from these non-circulating archival Illinois documents.

Chart Legends: An x in the column to the right of entries indicates ISL ownership. For example, in the Adams County hgh 1 mi chart, the d1950 x entry means that the ISL owns the 1950 Adams County general highway map at the 1 inch = 1 mile scale.

A number next to an x, such as x1, means that the ISL owns the county map as well as one supplement. One supplement usually indicates that it is a "(city) & vicinity" map. For instance, an x1 in an Adams County chart would mean a "Quincy & vicinity" map. An x3 on a Rock Island County chart would mean an "East Moline & vicinity," a "Moline & vicinity," and a "Rock Island & vicinity" map. A larger number, such as x16 in the Lake County charts, usually means township supplements, one or two townships to a sheet. A number but no x means that the ISL owns only the supplement and not the county-wide map.

IDOT City Street and City Traffic Maps: The Illinois State Library holds IDOT’s city street and city traffic maps but they are not included in this checklist. Some city street and city traffic maps are, however, included here because these "(city) & vicinity" maps were issued as supplements to the county series. IDOT’s older Map Descriptions and Price List indicated these maps were either 1 inch = 1200 feet or 800 feet scale. Maps listed in this document have not been reviewed for a scale statement, however. Township supplements to the major metropolitan counties are also included here and are usually a 1 inch = 1200 feet scale but, again, have not been reviewed for a scale statement.

For more information, or for a printed version, please contact:
Tom Huber
Map Librarian
Illinois State Library
300 S. Second St.
Springfield, IL 62701-1796
Email: thuber@ilsos.net
Telephone: 217/782-5823

Highway/Traffic 1 Mile PDF          Highway/Traffic 2 Mile PDF

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