Yer Comté non-métropolitain Hertfordshire : Ülke Birleşik Krallık, Ulus İngiltere.
Büyük Şehirleri : St Albans, Hemel Hempstead, Stevenage, Watford, Welwyn Garden City, Cheshunt, Hoddesdon, Bishop's Stortford, Hatfield, Elstree and Borehamwood, Hitchin, Letchworth Garden City, Harpenden, Hertford, Bushey, Rickmansworth, Potters Bar, Ware, Berkhamsted, Royston, Tring, Baldock, Sawbridgeworth, Buntingford, Graveley, Reed, Radwell, Preston, Pirton, Offley, Nuthampstead, Newnham, Lilley, Chipperfield, Langley, Knebworth, Codicote, King's Walden, Caldecote ve Rushden.
Bilgi mevcut değil : Nüfus, Rakım, Yüzölçümü ve İklim.
