This feature dataset provides essential boundary and administrative layers for the state of Illinois, supporting regional planning, infrastructure development, broadband expansion, and government decision-making. The dataset includes official jurisdictional and economic boundaries, ensuring accurate spatial data for state agencies, municipalities, and economic planners.

These layers are used for broadband infrastructure mapping, public policy implementation, zoning regulations, and funding allocation, making them a critical resource for data-driven decision-making across various sectors.

Layers Included:

• Census Blocks (2010) – Used for demographic analysis and broadband eligibility mapping.
• Congressional Districts (2020 Redistricting) – Updated federal legislative boundaries for policy analysis and representation.
• County Boundaries – Official county jurisdictional limits used for statewide and local planning.
• Electric Utility Boundaries – Defines service areas of electric providers for infrastructure coordination.
• Federal Lands – Identifies federally owned properties, including national parks, military bases, and protected lands.
• Opportunity Zones (Tracts) – Displays designated economic development zones to encourage investment and business growth.
• School Districts (E-Rate) – Represents school district boundaries to support education funding and broadband initiatives.
• State House Districts (2020 Redistricting) – Updated Illinois State House legislative boundaries.
• State Senate Districts (2020 Redistricting) – Updated Illinois State Senate legislative boundaries.
• Village Boundaries – Defines city, town, and village limits across Illinois.
• Townships/Precincts, Cities, and Villages – Displays townships and voting precincts; users can zoom in for detailed city and village boundaries.

Usage & Integration:

• Supports State & Local Planning – Provides official jurisdictional boundaries for zoning, economic development, and public infrastructure projects.
• Broadband Expansion & Utility Coordination – Used for mapping broadband availability and planning utility infrastructure.
• Legislative & Policy Applications – Assists in election planning, representation, and legislative resource allocation.
• Public & Private Sector Use – Utilized by government agencies, municipalities, businesses, and researchers for geospatial analysis.

Change Log:

• 3/14/2025 - Updated item details with significant elaboration on what is included in this service. 
• 1/30/2025 – Updated county and municipal boundaries to reflect recent administrative changes.
• 1/15/2025 – Added electric utility boundaries to support broadband and infrastructure coordination.
• 12/20/2024 – Refined opportunity zones and federal lands data for economic planning purposes.
• 11/10/2024 – Adjusted state and congressional district boundaries to match official redistricting updates.
• 10/05/2024 – Initial dataset release with core administrative and planning layers.

Access & Contact:

• Dataset Access: Available in ArcGIS Online

This Illinois Boundary-Based Layers dataset provides a comprehensive and authoritative resource for regional planning, broadband expansion, utility coordination, and legislative mapping across the state.