 Tulsa / <unk> / is the second @-@ largest city in the state of Oklahoma and 47th @-@ most populous city in the United States . As of July 2015 , the population was 403 @,@ 505 , an increase of 11 @,@ 599 over that reported in the 2010 Census . It is the principal municipality of the Tulsa Metropolitan Area , a region with 981 @,@ 005 residents in the MSA and 1 @,@ 151 @,@ 172 in the CSA . The city serves as the county seat of Tulsa County , the most densely populated county in Oklahoma , with urban development extending into Osage , Rogers , and Wagoner counties . 
