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The name Achtkarspelen, literally meaning "eight parishes", is derived from the original eight parishes within the grietenij, namely: Augustinusga, Buitenpost (the capital), Drogeham, De Kooten, Kortwoude, Lutkepost, Surhuizum and Twijzel. Achtkarspelen held a separate status within Friesland for many years. In the Middle Ages Achtkarspelen fell under the Bishopric of Münster, meanwhile the rest of Friesland was a part of the Bishopric of Utrecht.
The grietenij Achtkarspelen became a municipality in 1851 as a result of the Municipality Act of Minister of the Interior Johan Rudolph Thorbecke.
Population centres
The administrative centre in the municipality is Buitenpost.
"Postcodetool for 9285NH". Actueel Hoogtebestand Nederland (in Dutch). Het Waterschapshuis. Archived from the original on 21 September 2013. Retrieved 6 September 2013.