Here is what Jain tradition has to say about derasars (Jain temples) in those cities, with the information that is reliably available in JainKnowledge-style references.

• Lucknow

- Shri Padamprabhu Bhagwan Shwetambar Jain Derasar, Patwa Wali Gali, Jawahar Nagar, Chowk. This is a Shwetambar derasar located in the Chowk area of Lucknow. It follows the Shwetambar Jain tradition and hosts daily prayers and special pujas as per that sampradaya. You can read a concise note about this derasar here - Shri Adinath Bhagwan Jain Derasar, Chowk, Lucknow. This is another Shwetambar derasar in the Chowk area, also following the standard rituals of Shwetambar Jain worship. (Note: Jain Knowledge entries for specific Lucknow derasers appear under city-related temple listings.)

• Ayodhya

- Specific Jain derasars in Ayodhya are not clearly listed in the standard JainKnowledge temple-directory entries available publicly here. Ayodhya is traditionally associated in Jain legends with the birth of Tirthankaras such as Ajitnath, but a dedicated, well-documented derasar page in the JainKnowledge catalog for Ayodhya is not presently shown in the accessible listings.

• Prayagraj (Allahabad)

- Prayagraj is a major city in Uttar Pradesh with Jain communities, but a precise, citable JainKnowledge derasar page for Prayagraj is not readily visible in the current listings here. There are Jain temple activities in the region, but the direct derasar entry in JainKnowledge isn’t clearly available in the sources I can confirm now.

• Varanasi

- Varanasi hosts Jain centers and institutions, including those connected to Digambar and Svetambar traditions. A notable reference in the Jain community network is the Sansthan and Jain temple precincts around Banaras (Varanasi), but a specific, standalone JainKnowledge derasar page for a Varanasi city derasar is not clearly shown in the accessible listings here. There is a long-standing Jain presence in Banaras, including organizations like Varni Sansthan, which has historically contributed to Jain education and activity in the area. You can read a related note about Varni-based Jain activities here

Notes

• In Jain tradition, derasar names and affiliations (Digambar vs. Shwetambar) are an important distinction. The Lucknow entries above are Shwetambar derasars in the Chowk area.
• If you’d like, I can try to locate more precise JainKnowledge pages for Ayodhya, Prayagraj, and Varanasi by checking the sitemap more deeply or finding newer entries, and then share exact links and brief arth (meaning) for each temple.

If you want, tell me which city you’d like me to dive deeper into first and I’ll try to pull a more detailed, source-backed summary.