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We have identified 274 M-type Brown Dwarfs in the Hubble Space Telescope'sWide Field Camera 3 (WFC3) pure parallel fields from the Brightest ofReionizing Galaxies (BoRG) survey for high redshift galaxies. These arenear-infrared observations with multiple lines-of-sight out of our Milky Way.Using these observed M-type Brown Dwarfs we fitted a Galactic disk and halomodel with a Markov chain Monte Carlo (MCMC) analysis. This model worked bestwith the scale length of the disk fixed at $h$ = 2.6 kpc. For the scale heightof the disk, we found $z_0 = 0.29^{+0.02}_{-0.019}$ kpc and for the centralnumber density $\rho_0 = 0.29^{+0.20}_{-0.13}$ \#/pc$^3$. For the halo wederived a flattening parameter $\kappa$ = 0.45$\pm{0.04}$ and a power-law index$p$ = 2.4$\pm{0.07}$. We found the fraction of M-type brown dwarfs in the localdensity that belong to the halo to be $f_{h}$ = 0.0075$^{+0.0025}_{-0.0019}$.We found no correlation between subtype of M-dwarf and any model parameters.  The total number of M-type Brown Dwarfs in the disk and halo was determinedto be $58.2^{+9.81}_{-6.70} \times10^{9}$. We found an upper limit for thefraction of M-type Brown Dwarfs in the halo of 7$^{+5}_{-4}$\%. The upper limitfor the total Galactic Disk mass in M-dwarfs is$4.34^{+0.73}_{-0.5}\times10^{9}$ $M_{\odot}$, assuming all M-type Brown Dwarfshave a mass of $80 M_J$.

The Size and Shape of the Milky Way Disk and Halo from M-type Brown Dwarfs in the BoRG Survey