Today it is prevalent on Kodiak Island and in Ninilchik (Kenai Peninsula), Alaska; it has been isolated from other varieties of Russian for over a century.
[1] Kodiak Russian was natively spoken on Afognak Strait until the Great Alaskan earthquake and tsunami of 1964.
It is now moribund, spoken by only a handful of elderly people, and is virtually undocumented.
Here are some examples of Alaskan Russian from the village of Ninilchik.
All of them are identical to modern Russian, except from two words from the last one:[4]