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has 4,778 inhabitants as of 1 January 2002.
The administrative centre of Gjerdrum is Ask.
| Akershus |
| Asker | Aurskog-Høland | Bærum | Eidsvoll | Enebakk | Fet | Frogn | Gjerdrum | Hurdal | Lørenskog | Nannestad | Nes | Nesodden | Nittedal | Oppegård | Rælingen | Skedsmo | Ski | Sørum | Ullensaker | Vestby | Ås |
| Municipalities of Norway | Norway |