According to the Family History Center, SLC
Name Bromfield Parish
(Rappahannock and Madison counties, Virginia : Episcopal) Notes This parish was formed from St. Mark's Parish in 1752. At that time, it was part of Culpeper County.
When Madison County was formed from Culpeper County in 1792, Bromfield Parish became its parish. In 1833, its boundaries were increased to cover Rappahannock County. For many years, it was incorrectly called Bloomfield Parish. References (Use for) Bloomfield Parish (Rappahannock and Madison counties, Virginia : Episcopal)
Scanning some of the other results, it appears that Bromfield Parish may have contained a portion of Culpeper County even after Madison County was cut away from Culpeper.