Townland of Clondervish, parish of Moylagh, Co. Meath

Not all the locations mentioned on the Tithe records are townlands, and in this case Clondervish seems to be what is sometimes called a population centre or small village. It's shown as "Clondervis" on the c1840 1st Edition OSI maps in the northern part of Milltown townland, Moylagh civil parish - see the attachment below, there's no sign of the village on the later c1890 OSI map. You can view the historic OSI maps showing the area on GeoHive/OSI using this link.

I think the smaller numbers included on some areas of the 1st Edition OSI maps relate to height references, the larger numbers are the area of each townland. The Griffith Notebooks usually predate the full valuation and might include some details, these were created in preparation for the valuation - the surviving books are indexed on the National Archives website - see Valuation Office books 1824-1856.

As far as I can see the declaration at the beginning of the Tithe details for Moylagh parish is dated 1st May 1825.

On the Primary Valuation (Griffith's) the immediate lessor and possible owner of most of Milltown townland, Moylagh is a James W.L. Naper - his estate records might list details of tenants... if they have survived, and assuming he or his family held the land between the Tithe and Valuation records.. Estate records can be very difficult to track down and research... another possible long-shot source might be The Registry of Deeds - most of these relate to landed-gentry people owning land, and long leases, but some smaller properties are included.