In 1868, the parish of Newmarket contained the following places:
"NEWMARKET, (or Trelawnyd), a parish in the hundred of Prestatyn, county Flint, 6 miles N.W. of Rhyl, its post town. The village, which is small, is situated on the river Prestatyn, and near Offa's Dyke. The parish contains the extensive tumulus locally called the "Gop," which is said by some to have been erected by the conquerors of the Ordovices, and by others to have been the burial-place of Queen Boadicea. Petty sessions are held in the village, which was once a market town. The living is a perpetual curacy in the diocese of St. Asaph, value £90, in the patronage of the bishop. The church, dedicated to St. Michael, is a modern structure. In the churchyard is an ornamented cross of the 14th century. There is an endowed school. The Independents have a place of worship. Golden Grove is the principal residence.
"GOP, a township in the parish of Newmarket, county Flint, North Wales, 4 miles N.E. of Rhyddlan."
"GRAIG, a township in the parish of Newmarket, county Flint, North Wales, 5 miles N.W. of Holywell."