The table is colour-coded based on the classification or "listing" of the hill. The types that occur in Gloucestershire are Marilyns, HuMPs and TuMPs, listings based on topographical prominence. "Prominence" correlates strongly with the subjective significance of a summit. Peaks with low prominences are either subsidiary tops of a higher summit or relatively insignificant independent summits. Peaks with high prominences tend to be the highest points around and likely to have extraordinary views. A Marilyn is a hill with a prominence of at least 150 metres or about 500 feet.^[1] A "HuMP" (the acronym comes from "Hundred Metre Prominence) is a hill with a prominence of at least 100 but less than 150 metres.^[2] In this table Marilyns are in beige and HuMPs in lilac. The term "sub-Marilyn" or "sub-HuMP" is used, e.g. in the online Database of British and Irish Hills to indicate hills that fall just below the threshold. To qualify for inclusion, hills must either be 250 metres or higher with a prominence of at least 30 metres, below 250 metres with a prominence of at least 90 metres (the threshold for a sub-HuMP) or be in some other way notable. In this context, "TuMP" is used to connote a hill with a prominence of at least 30 but less than 100 metres. For further information see the Lists of mountains and hills in the British Isles and the individual articles on Marilyns, HuMPs, and TuMPs. By way of contrast, see also the article listing Tumps (a traditional term meaning a hillock, mound, barrow or tumulus).

Notes:

1. The following high points have not been included for the reasons shown:

• Cutsdean Hill(305 m) only has a prominence of 26 metres.^[3]

• List of mountains and hills of the United Kingdom
• List of Marilyns in England