Renewed interest of ultra narrow row production (UNR) methods for cotton (Gossypium hirsutum L.) by industry, researchers, and producers, suggests evaluation of several management components is needed in order to optimize them. Plant populations and variety selection are among those agronomic factors requiring further evaluation. Field studies were conducted at the Delta Research and Extension Center in Stoneville, MS, in 1998 through 2000. In the first study, 7.5-in., 15-in., and 40-in. row spacings and six varieties consisting of NuCotn 35, ST 474, ST BXN47, PM 1220RR, MD21ne Normal-leaf, and MD51ne Okra-leaf were evaluated. In 1999 and 2000, row spacings were revised to 10-in., 15-in., and 40- in. rows and varieties consisted of Fibermax 832, ST 474, ST BXN47, SG 125BR, PM 1220RR, and NuCotn 35. A second study consisted of 7.5-in. and 15-in. row spacings and six plant populations ranging from 75 000 plants/A to 200 000 plants/A in 1998. In 1999 and 2000, 10-in. and 15-in. row spacings and four plant populations ranging from 75 000 plants/A to 150 000 plants/A were evaluated.