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In order to assess the multiplicity statistics of stars across spectral typesand populations in a volume-limited sample, we censused nearby stars forcompanions with Robo-AO. We report on observations of 1157 stars of allspectral types within 25 pc with decl. $>-13^{\circ}$ searching for tightcompanions. We detected 154 companion candidates with separations ranging from$\sim$0.15$''$ to 4.0$''$ and magnitude differences up to$\Delta$m$_{\textit{i'}}\le$7 using the robotic adaptive optics instrumentRobo-AO. We confirmed physical association from Gaia EDR3 astrometry for 53 ofthe companion candidates, 99 remain to be confirmed, and 2 were ruled out asbackground objects. We complemented the high-resolution imaging companionsearch with a search for co-moving objects with separations out to 10,000 AU inGaia EDR3, which resulted in an additional 147 companions registered. Of the301 total companions reported in this study, 49 of them are new discoveries.Out of the 191 stars with significant acceleration measurements in theHipparcos-Gaia catalog of accelerations, we detect companions around 115 ofthem, with the significance of the acceleration increasing as the companionseparation decreases. From this survey, we report the following multiplicityfractions (compared to literature values): 40.9%$\pm$3.0% (44%) for FGK starsand 28.2%$\pm$2.3% (27%) for M stars, as well as higher-order fractions of5.5%$\pm$1.1% (11%) and 3.9%$\pm$0.9% (5%) for FGK stars and M type stars,respectively.

An Adaptive Optics Census of Companions to Northern Stars Within 25 pc with Robo-AO