Oceanimonas doudoroffii ATCC 27123T is an obligately aerobic Gram-negative rod of the class Gammaproteobacteria It was first isolated from surface seawater off the coast of Oahu, HI, USA, in 1972. The predicted genome size is 3,832,938 bp (G+C content, 60.03%), which contains 3,524 predicted coding sequences.