Area code 605

North American Area code 605 is the telephone area code serving the entire state of South Dakota, and is one of the area codes that was created in 1947. It is also one of a gradually decreasing number of single-state, single LATA, single area code areas. (North Dakota uses only the Area code 701, but is split into two LATAs, one of which includes Minnesota.)

Area code 406Area code 701Area code 320Area code 218Area code 507Area code 712Area code 308Area code 307
The map to the right is clickable; click on an area code to go to the page for that code. Map of South Dakota's area code in blue (with border states)

Communities included
gollark: Calculators... generally still seem to be a scam, though.
gollark: Anyway, at my school we mostly use(d) Casio FX-991EX calculators, which have lots of nice features.
gollark: <@!665664987578236961> You may have only asked styro once, but I read basically every new message on this discord server (I have a lot of free time and mostly just skim them) and I'm pretty sure you ask similar questions a lot. And it's mildly irritating.
gollark: The mildly-higher-res display lets it display square roots and fractions nicely.
gollark: Also, this model supports matrices and stuff.
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