Of the 13,860 toponyms that were ambiguous according to GNIS, 1827 of them were found in MAC1, of which only 588 had discriminators within a ±5-word window (i.e., discriminators which matched gazetteer features that disambiguated the toponym).
67.82% of the 1827 toponyms found in MAC1 that were ambiguous in GNIS lacked a discriminator.