The $g$ factors of the ${9}^{\ensuremath{-}}$ state (2.236 MeV, $\ensuremath{\tau}=694$ nsec) and the ${12}^{+}$ state (\ensuremath{\sim}3.1 MeV, $\ensuremath{\tau}=228$ nsec) in $^{200}\mathrm{Pb}$ have been measured as $g({9}^{\ensuremath{-}})=\ensuremath{-}0.030(3)$ and $g({12}^{+})=\ensuremath{-}0.157(6)$ by a time-differential perturbed-angular-distribution technique. The states were populated by $^{197}\mathrm{Au}(^{7}\mathrm{Li}, 4n)^{200}\mathrm{Pb}({9}^{\ensuremath{-}})$ and $^{197}\mathrm{Au}(^{7}\mathrm{Li}, 3n)^{200}\mathrm{Pb}({12}^{+})$ reactions with pulsed lithium beams. An in-beam superconducting magnet supplied a field of \ensuremath{\sim}60 kG. The ${9}^{\ensuremath{-}}$ state $g$ factor is in agreement with the additivity value obtained from empirical single-particle $g$ factors for a $({{i}_{\frac{13}{2}}}^{\ensuremath{-}1}, {{f}_{\frac{5}{2}}}^{\ensuremath{-}1}){9}^{\ensuremath{-}}$ configuration and consistent with a small anomalous orbital contribution $\ensuremath{\delta}{g}_{l}$ for the neutron. The $g$ factor for the ${12}^{+}$ state in $^{200}\mathrm{Pb}$ is in surprisingly good agreement with those for the ${({i}_{\frac{13}{2}})}^{\ensuremath{-}2}{12}^{+}$ state in $^{206}\mathrm{Pb}$ and the ${{i}_{\frac{13}{2}}}^{\ensuremath{-}1}$ state in $^{205}\mathrm{Pb}$, in view of the possible existence of number-dependent effects.NUCLEAR REACTIONS $^{197}\mathrm{Au}(^{7}\mathrm{Li}, 4n)^{200}\mathrm{Pb}({9}^{\ensuremath{-}})$, $^{197}\mathrm{Au}(^{6}\mathrm{Li}, 3n)^{200}\mathrm{Pb}({12}^{+})$ ${E}_{\mathrm{Li}}=34$ MeV, pulsed beam, measured spin rotation in $B=60$ kG, deduced $g$.