The United Pentecostal Church International (UPCI) is a Christian denomination of the Pentecostal movement. The UPCI is the largest Oneness Pentecostal political organization in the world, and was formed by a 1945 merger of the Pentecostal Church, Incorporated, and the Pentecostal Assemblies of Jesus Christ. The UPCI is headquartered in Hazelwood, Missouri.The UPCI is one of the fastest growing denominations in North America cial:Categories&article=United_Pentecostal_Church" title="Special:Categories">Categories: Articles lacking sources | Accuracy disputes | Christian denominations of North America | Christian denominations | Christian evangelicalism | Pentecostal denominations | Protestantism