Illinois Primary and Secondary Roads from 2023 TIGER/Line

A 2023 extract of Illinois road centerlines from the U.S. Census Bureau's MAF/TIGER Database. It contains primary roads (MTFCC S1100) like interstate highways and secondary roads (MTFCC S1200) such as U.S. and State Highways. The shapefiles are designed to stand alone or combine for national coverage.

Use Cases

• Map primary road networks (MTFCC S1100) for statewide transportation planning and analysis.
• Analyze the distribution and connectivity of secondary roads (MTFCC S1200) for infrastructure assessment.
• Combine this Illinois-specific shapefile with other state extracts to create a seamless national road dataset.
• Perform spatial queries on road features using the associated MAF/TIGER Feature Classification Codes (MTFCC).

Strengths

• Data originates from the authoritative U.S. Census Bureau MAF/TIGER Database, ensuring national consistency.
• Features are topologically integrated, representing a seamless file with no overlaps or gaps between parts.
• Includes specific MAF/TIGER Feature Classification Codes (S1100, S1200) for precise identification of road types.

Limitations

• The dataset is limited to Illinois, requiring combination with other states for national analysis.
• Specific quantitative details like total road miles or segment counts are not provided in the input.
• As a 2023 extract, it may not reflect road network changes after its creation date.

Provenance

Source

U.S. Census Bureau, Department of Commerce

Collection Method

Extracted from the Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database.

Time Range

2023

Freshness

Last updated in August 2025, containing data from the 2023 TIGER/Line series.

Geography

State of Illinois, United States