Figure D7 is a State map of Connecticut showing substate region definitions in terms of census tracts, specified by a 6-digit tract identifier.
The substate region referred to as Eastern is made up of tracts 690100 - 870100 in New London County; tracts 840100 - 881500 in Tolland County; tracts 800300 - 908100 in Windham County.
The substate region referred to as North Central is made up of tracts 400100-524100 in Hartford; tracts 425300 - 425500 in Litchfield County; tracts 526100 - 538202, 890100, and 890200 in Tolland County.
The substate region referred to as Northwestern is made up of tracts 200100 - 257100 in Fairfield County; tract 330100 in Hartford County; tracts 250100 - 362102 in Litchfield County; tracts 341100 - 361300 in New Haven County.
The substate region referred to as South Central is made up of tracts 110100 - 110600 in Fairfield County; tracts 541100 - 680100 in Middlesex County; tracts 120100 - 194202 in New Haven County; tracts 650100 - 660102 in New London County.
The substate region referred to as Southwest is made up of tracts 010101 - 105200 in Fairfield County.