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This may solve your problem. This is a book, Preston Family Genealogy which includes a genealogy of Preston of Virginia. It's free also to download.

https://archive.org/details/prestongenealogy00byupres/page/n25/mode/2up   

Please see below from johngrenham.ie

When you click on the map (be aware, website provides max 5 free clicks/24 hours) you will see that Delvin district was intact into the 20th century

Registration District

As a result of the original arrangements for administering the system, the registration districts were, and still are, largely identical to the old Poor Law Unions. As these were based on natural catchment areas, normally consisting of a large market town and its rural hinterland, rather than on the already existing administrative divisions of townland, parish and county, registration districts for births, marriages and deaths cut right across these earlier boundaries - a fact that can be very significant for research. For example, Waterford registration district, centred in the town of Waterford, also takes in a large part of rural south Co. Kilkenny; Ballinasloe district contains areas in both south Roscommon and east Galway, Boyle includes parts of Roscommon and Sligo.

A Ireland-wide map of registration districts is on this site, here.

The only comprehensive guide to which towns and townlands are contained in each registration district is to be found in a series of pamphlets produced in the nineteenth century by the Registrar-General's Office for the use of each of the local registrars. These are collected as Townlands in poor law unions : a reprint of poor law union pamphlets of the general registrar's office with an introduction, and six appendices relating to Irish genealogical research, (repr. Ed. Handran, George B. 1997 Higginson, Salem Ma.) copies of which can be found in the National Library (reference: Ir 9141 b 35) or on Eneclann CD-ROM. .This work is particularly useful when a problem arises in identifying a variant version of a townland name given in the original register entry for a marriage, birth or death. By scanning the lists of townlands in the relevant district in which the entry is recorded, it is almost always possible to identify the standard version of the name and, from this, go on to census, parish and land records. A version of the pamphlets is the basis of this site's click-through Poor Law Union map.

To go in the other direction, to find out what registration district a particular town or townland is in, the standard source is the Alphabetical Index to the Towns, Townlands and Parishes of Ireland. Three editions of this were published, based on the census returns for 1851, 1871, and 1901. In the first two, the registration district is recorded as the Poor Law Union; in the 1901 Index it does not appear in the body of the work, but may be found as an appendix. Copies of these can be found on open access in the National Library, the National Archives, The General Register Office itself, or in any library. The 1851 is by far the most widely available, and an expanded version can be found here at www.johngrenham.com/places. The 1901 is on the Irish Genealogical Research Society website www.irishancestors.ie.

My great-grandfather Philip Coyle was originally from Tonaghmore in the parish of St. Feighins.  I think his mother was Ann Masterson, father Thomas Coyle.  Philip was born 1833.  Do you think it would be possible for me to obtain a baptismal certificate for Philip and who would I write to?  Or could anybody look up the name Coyle in the Tithe Books?

I am fairly certain that Anne was the daughter of Laurence (married in 1792 to Ann Cullin). Anne was born in 1803. Laurence is my great, great, great, great Grandfather.

Kind regards,

Allan

Dear All,

I read with interest how the Masterson have spread out over the world. I am currently researching another line of the Masterson who were transplanted during the Cromwellian confiscations, initially to Mayo (barony of Costello), then to the Barony of Clare in Galway. This was Edward Masterson, heir to Sir Richard of Ferns. Edwards son, Robert, from whom our family claim descent, was granted land in Roscommon and it is possible that we descend from one of his sons who may have moved to Westmeath. I have all of the early pedigrees researched and drawn out, of the different lines of Mastersons up to the early 1800 (including the 1641 depositions as Edward was in the Catholic Confederates, and all details of both the Cromwellian and Jacobite confiscations). Happy to share these to anyone interested.

Thing is, although we are the only Masterson family in this part of North Westmeath, we are close to the boarder with Longford and Cavan, the traditional home of Celtic Mastersons. As Catholic records are sketchy in the late 1600-early 1700 (we can trace back to Hugh and Edmund who died in the 1750s) and am hoping for some help on a more scientific level.

Therefore, would anyone in this chat have completed either a MyHeritage or 23&Me DNA analysis?: If so, I would be very interested to link with you to see if we have cross over.

Additionally, would anyone who is Wexford based be willing to take a simple DNA analysis to see if we are (distantly) related? I would be very grateful for any help.

Kind regards, Allan J Blacoe-Masterson     

Currently trying to understand how (and if) the Mastersons of North Westmeath are related the the Wexford Mastersons of Ferns. Stories within the family tell of Mastersons moving north to the Midlands possibly via Laois some time in the early 1600, having already been, or later becoming Roman Catholic. The family story goes that our ancestor was a younger son who married a Catholic, having been dispossessed during the Cromwellian period. I note that Many of the branches of the Masterson in Wexford regained land in some shape of form except for Patrick (see below). none seem to have been transplanted West.  What is interesting is that in Granard, Co. Longford in the 1650 census, 9 (Celtic Irish) Masterson families are listed. So far, I have been unable to connect these families with the various Mastersons in and around North Westmeath. 

I note that there were already Catholic Mastersons in the early 18th C in Wexford (Marie, born the Patrick Masterson and Catherine Jolous/Jolus in 1709) and a Patrick Masterson was dispossessed in the 1650's having farmed land with Redmond Roch and Jasper Synnott, though he himself was listed as Protestant.
 
I have found 2 Mastersons (Edward and Edmond) in Tankardstown parish, Laois, who were transported in the 1650; they rented farms from the Hovenden/Graham families which fit at least that family story. I cannot locate them after this period (in Western counties that is, though I don't know where their transplantation certificates were issued). If they are our Mastersons, they may have moved north to Westmeath instead of West.

The Mastersons of Likblea, Westmeath first appear in (RC) burial records in the 1764 (Hugh) followed by John, Edmond, Margery and Walter. The family established  themselves close to Castlepollard and farmed with a combined acreage over 3 family farms of about 250 acres until recently.

Any thoughts would be welcome, particularly if there are any Wexford Mastersons reading this with any family intel on possible land loss, conversion and move to the Midlands.

Kind regards,

Allan