| Gjerdrum | |
| Idnumber: | 3230 |
| County: | Akershus |
| District: | Romerike |
| Capital: | Ask |
| Demonym: | Gjermsokning |
| Language: | Bokmål |
| Coatofarms: | Gjerdrum komm.svg |
| Munwebpage: | www.gjerdrum.kommune.no |
| Mayor: | Anders Ostensen[1] |
| Mayor Party: | Labor Party[2] |
| Mayor As Of: | 2011[3] [4] [5] [6] |
| Area Rank: | 396 |
| Area Total Km2: | 83 |
| Area Land Km2: | 82 |
| Area Water Percent: | 0.03 |
| Population As Of: | 2013 |
| Population Rank: | 192 |
| Population Total: | 6267 |
| Populationpercent: | 0.11 |
| Population Density Km2: | 60 |
| Population Increase: | 31.6 |
| Coordinates: | 60.0825°N 11.0144°W |
| Utm Zone: | 32V |
| Utm Northing: | 6662335 |
| Utm Easting: | 0612078 |
| Geo Cat: | adm2nd |
Gjerdrum (in Norwegian ˈjæ̀rdrʉm/) is a municipality in Akershus county, Norway. It is part of the traditional region of Romerike.
Gjerdrum borders the municipalities of Nannestad, Nittedal, and Ullensaker, and Lillestrøm. The administrative centre of the municipality is the village of Ask.
The municipality (originally the parish) is named after the old Gjerdrum farm (Norse Gerðarvin). The first element is the genitive of a river name Gerð and the last element is vin 'meadow, pasture'. The river name is derived from the Norse word garðr meaning 'fence' and so the meaning is 'the river whose function is a fence (and/or as a border)'.
The coat of arms is from modern times. They were granted in 1993. The arms show a traditional Norwegian form of roundpole fence. The arms are also canting because the name of the municipality refers to a fence.[7]
Gjerdrum was established as a municipality on 1 January 1838 (see formannskapsdistrikt).
Store norske leksikon says that artefacts indicate that humans have lived in Gjerdrum since ancient times; furthermore the names of places also indicate the same.[8]
See main article: 2020 Gjerdrum landslide. On 30 December 2020 a quick clay landslide occurred in the village of Ask[9] within Gjerdum municipality. 10 people died.[10] The slide measured 700by, injured 10 people (including one seriously), left 10 unaccounted for and led to 1,000 being evacuated from the village, with several homes having been destroyed in the slide.[11]
Gjerdrum lies on the southwestern part of the Romerike Plain (Romerikssletta); this eastern part of the municipality lies at a low altitude and is covered by significant[12] layers of clay that was deposited, towards the end of the previous ice age.
The quick-clay at Gjerdrum was deposited (in a fjord)[13] around 8,000 or 9,000 years ago, when the sea level was around 200 meters higher.
In 2021, 1258 inhabitants were immigrants or Norwegian-born to immigrant parents. 264 inhabitants had Polish parents and/or were Polish (themselves); 173 had Lithuanian parents and/or were Lithuanian.[14]
| -- | + Number of minorities (1st and 2nd generation) in Gjerdrum by country of origin in 2015--> | |
|---|---|---|
| Ancestry | Number | |
 Poland | 264 | |
 Lithuania | 173 | |
 Sweden | 70 | |
 Pakistan | 67 | |
 Philippines | 56 | |
 Iraq | 43 | |
 Denmark | 35 | |
 Thailand | 35 | |
 Latvia | 34 | |
| 30 | ||
 Trinidad and Tobago | 3 |
The local sports team is Gjerdrum IL.