Bed Sizes Alaskan King 2025 Dimensions. So, let’s see some of the common oversized mattress sizes you can get: Since alaska is the largest state in america, it’s only fair to call the alaskan king size mattress.

Alaskan king beds have an overall length of 108” (274 cm) and equal width of 108” (274 cm). The original alaskan king bed is 9 x 9 feet or 108” x 108”.