ðə sˈɪɾi ʌv oʊmɪtˈɑːmə wʌz ɪstˈæblɪʃt ˌɔn mˈɑːɹtʃ twˈɛnti sˈɛvən, tˈuː θˈaʊzənd sˈɪks, fɹʌmðə mˈɜːdʒɚɹ ʌvðə tˈaʊnz ʌv ɑːɡˈɑːwə ænd maɪnˈɔːɹi bˈoʊθ fɹʌm hˌɪɡɐʃˌɪɪbɐɹˈæki dˈɪstɹɪkt, ænd ðə vˈɪlɪdʒ ʌv tˈæmɚɹi fɹʌm nˌɪɪhˈɑːɹɹi dˈɪstɹɪkt.
The city of Omitama was established on March 27, 2006, from the merger of the towns of Ogawa and Minori (both from Higashiibaraki District), and the village of Tamari (from Niihari District).