At its broadest extent, the Wikipedia entry for "Greater Hartford" says the Hartford-East Hartford-Middletown, CT Metropolitan NECTA (New England City and Town Area) consists of 54 towns, including 25 in Hartford County, 5 in Litchfield County, 6 in Middlesex County, 2 in New London County, 12 in Tolland County, and 4 in Windham County. But even at the narrowest, I think of Greater Hartford as everything from Enfield to Meriden and from Bristol to Vernon.