The entries contain: English name of the site, Roman name where known, four figure Ordnance Survey map reference, bibliographic references, the type of site, occupation period and military units associated with the site and links to regional maps of sites.

English names follow those on the Ordnance Survey's Map of Roman Britain - 4th edition or where more recently identified the usage adopted in Britannia. Alternative modern names are cross-referenced.

Roman names normally follow Rivet and Smith, The Place Names of Roman Britain, unless more recent research suggests other names.

Garrisons or units associated with sites primarily follow Holder, The Roman Army in Britain, but Jarrett, Non-legionary troops in Roman Britain, Britannia XXV (1994) has also been used. Unit names are the final one where known. For example Legio VI Victrix Britannica Pia Fidelis received the title Britannica under Severus and Pia Fidelis under Domitian.

Uncertainties of identification
are indicated by question marks. For example a "?" after a unit's name indicates uncertainty as to the identification of a particular unit with the site. A "?" before any part of an entry indicates that the name or data that follows is an uncertain translation of a Roman text or inscription. Thus Equites Catafractarii? indicates uncertainty as to whether the unit should be associated with its location. Whilst ?Cohors 1 Aelia classica shows uncertainty over the exact form that the name that the unit should take, but that the unit is definitely known at that location.