U3Co4Ge7 and U3Co2Ge7 have been prepared as single crystals by solution growth from tin flux. U3Co4Ge7 crystallizes in the tetragonal structure (I4/mmm) with lattice parameters a = 0,4116 nm and c = 2,749 nm and U3Co2Ge7 possesses the orthorhombic structure (Cmmm) with a = 0,4151 nm, b = 2,498 nm, c = 0,4160 nm.