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Parsec-scale Faraday rotation measure (RM) maps are presented for the radiogalaxies M87, 3C 111, and 3C 120. These Very Long Baseline Array observationswere made at 8, 12, and 15 GHz. M87 has an extreme RM distribution that variesfrom -4000 radians m^-2 to more than 9000 radians m^-2 across a projecteddistance of 0.3 pc in its jet. M87 has no polarized flux closer than 17 masfrom the core. 3C 111 and 3C 120 both show polarized emission in their coresthat is consistent with the expectations of unified schemes for thesebroad-line radio galaxies. 3C 111 has an RM gradient that increases from -200radians m^-2 four mas from the core to -750 radians m^-2 on the side of the jetclosest to the core. 3C 120 has a more moderate RM distribution in the jet ofapproximately 100 radians m^-2, but this increases by an order of magnitude inthe core.Comment: Accepted to ApJ Letters. 8 pages, 5 figures (4 color

Faraday Rotation Measures in the Parsec-Scale Jets of the Radio Galaxies M87, 3C 111, and 3C 120