The Long Island Index receives data from a variety of governmental agencies and organizations.

Special thanks to the following groups for sharing their data and expertise:

Center for Governmental Research
Center for Urban Research, CUNY Graduate Center
Central Pine Barrens Joint Planning & Policy Commission
City of Glen Cove
City of Long Beach
Columbia University, Teachers College
Hofstra University
Long Island Bus
Long Island Pine Barrens Society
Long Island Real Estate Report
Metropolitan Transportation Authority—Long Island Rail Road
Nassau BOCES
Nassau County Department of Public Works – Planning Division
Nassau County Planning Department
New York State Education Department
New York State Department of Environmental Conservation, Region 1
New York State Department of Transportation
North Shore-Long Island Jewish Health System
PricewaterhouseCoopers/National Venture Capital Association MoneyTree™ Thomson Financial
Regional Plan Association
Stony Brook University, Center for Survey Research
Suffolk County Division of Planning & Environment
Suffolk County Department of Social Services
Suffolk County Transit
Towns of Babylon
Town of Brookhaven
Town of East Hampton
Town of Hempstead
Town of Huntington
Town of Huntington HART Bus Systems
Town of Islip
Town of North Hempstead
Town of Oyster Bay
Town of Riverhead
Town of Shelter Island
Town of Smithtown
Town of Southampton
Town of Southold
Village of Babylon
Village of Farmingdale
Village of Freeport
Village of Hempstead
Village of Lynbrook
Village of Patchogue
Village of Port Jefferson
Village of Rockville Centre
Village of Valley Stream
Village of Westbury