Lake County Illinois Boundary with Weekly Updates

Lake County, Illinois provides a working version of its political boundary for mapping purposes. The dataset is updated on a weekly basis and includes the shoreline of Lake Michigan as its eastern boundary, while the north, west, and south boundaries are based on compiled survey data. The data is available in multiple formats including CSV, GEOJSON, and KML.

Use Cases

• Create county-level reference maps based on the provided political boundary.
• Perform spatial joins for administrative data based on the county boundary geometry.
• Integrate the boundary into regional mapping systems based on its alignment with neighboring jurisdictions.
• Update mapping applications based on the weekly update frequency.

Strengths

• Updated on a weekly basis, ensuring current boundary information.
• Available in multiple geospatial formats including GEOJSON, KML, and GPKG.
• Boundary is defined with specific reference to Lake Michigan shoreline and compiled survey data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The boundary is described as a 'working version' and may not perfectly align with neighboring county or state maps.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Lake County, Illinois

Collection Method

Likely compiled from survey data and maintained for internal mapping purposes.

Time Range

null

Freshness

Weekly updates; last metadata update was 2026-03-21.

Geography

Lake County, Illinois, USA, including a portion of Lake Michigan.