Claim: Roman Catholic Diocese of Mainz is from Germany and has a population of 742,165.
Evidence: (as of 2016)
2,899,491
742,165 (25.6%) 
As per 2014, it pastorally served 749,583 Catholics (25.9% of 2,891,000 total) on 7,692 km² in 319 parishes, 504 priests (409 diocesan, 95 religious), 124 deacons, 447 lay religious (132 brothers, 315 sisters), 19 seminarians.