Prayagraj district, formerly and colloquially known as Allahabad district, is the most populous district in the Indian state of Uttar Pradesh. Prayagraj city is the district headquarters of this district. The District is divided into blocks within tehsils. As of 2011, there are 20 blocks in eight tehsils. The Prayagraj division includes the districts of Pratapgarh, Fatehpur, Kaushambi and Prayagraj, with some western parts that had previously been part of Allahabad District becoming part of the new Kaushambi District. The administrative divisions are Phulpur, Koraon, Meja, Sadar, Soraon, Handia, Bara, Shringverpur and Karchana.
The district is bordered by five districts, four of which lie within Uttar Pradesh and one in the neighboring state of Madhya Pradesh. To the north, Prayagraj district shares its boundary with Pratapgarh district. The eastern border is adjacent to Bhadohi district (formerly known as Sant Ravidas Nagar district). Continuing southeast, the district touches Mirzapur district. On the southern side, it borders Rewa district in Madhya Pradesh, forming an inter-state boundary. To the west, Prayagraj is flanked by Kaushambi district and slightly with Chitrakoot district.