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In the context of the local gauge group $SU(3)_c\otimes SU(3)_L\otimesU(1)_X$, we look for possible four family models, where all the particles carryordinary electric charges. Thirteen different anomaly-free fermion structuresemerge, out of which only two are realistic. For the simplest physicalstructure, we calculate the charged and neutral weak currents and thetree-level Fermion masses. We also look for new sources of flavor changingneutral currents in the quark sector, in connection with the upcomingexperimental results at the Large Hadron Collider.

$SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ models with four families