ðə sˈɪks bˈʌɹoʊz ðæt hæv sɪɡnˈɪfɪkənt ˈɛɹiəz wɪðˌɪn ˈʌðɚ kˈoʊdz ɑːɹ bˈɛksli, pˈɑːɹtli wɪðˌɪn ðə dˈɑːɹtfɚd zˈiəɹoʊwˈʌn θɹˈiːtˈuːtˈuː kˈoʊd; bɹˈɑːmli, pˈɑːɹtli wɪðˌɪn ðɪ ˈɔːɹpɪŋtən zˈiəɹoʊwˈʌn sˈɪksˈeɪtnˈaɪn ænd wˈɛstɚɹˌæm zˈiəɹoʊwˈʌn nˈaɪnfˈaɪvnˈaɪn kˈoʊdz; kɹˈɔɪdɑːn, pˈɑːɹtli wɪðˌɪn ðɪ ˈɔːɹpɪŋtən zˈiəɹoʊwˈʌn sˈɪksˈeɪtnˈaɪn ænd ɹˈɛdhɪl zˈiəɹoʊwˈʌn sˈɛvənθɹˈiːsˈɛvən kˈoʊdz; ˈɛnfiːld, pˈɑːɹtli wɪðˌɪn ðə wˈɔlθæm kɹˈɔs zˈiəɹoʊwˈʌn nˈaɪnnˈaɪntˈuː kˈoʊd; hˈeɪvɚɹɪŋ, mˈoʊstli wɪðˌɪn ðə ɹˈɑːmfɚd zˈiəɹoʊwˈʌn sˈɛvənzˈiəɹoʊˈeɪt kˈoʊd; ænd hˈɪlɪŋdən, pˈɑːɹtli wɪðˌɪn ðɪ ˈʌksbɹɪdʒ zˈiəɹoʊwˈʌn ˈeɪtnˈaɪnfˈaɪv, slˈaʊ zˈiəɹoʊwˈʌn sˈɛvənfˈaɪvθɹˈiː ænd wˈɑːtfɚd zˈiəɹoʊwˈʌn nˈaɪntˈuːθɹˈiː kˈoʊdz.
The six boroughs that have significant areas within other codes are Bexley, partly within the Dartford (01322) code; Bromley, partly within the Orpington (01689) and Westerham (01959) codes; Croydon, partly within the Orpington (01689) and Redhill (01737) codes; Enfield, partly within the Waltham Cross (01992) code; Havering, mostly within the Romford (01708) code; and Hillingdon, partly within the Uxbridge (01895), Slough (01753) and Watford (01923) codes.