Guam.

110 V · 60 Hz on Type A, Type B.

A US territory with a fully American electrical system: 110 V 60 Hz on flat-blade Type A and B sockets. Gear from the US mainland, Canada or Japan fits directly — Japanese devices are happy with the voltage too. European visitors need a pin adapter and dual-voltage devices for anything with a motor or heater.

The voltage window

A nominal 110 V supply may legitimately sit anywhere between 99 and 121 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

Grid facts verified against IEC World Plugs — Guam. Prose is our own.

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Plug straight in — Guam runs 110 V 60 Hz on Type A, Type B.

Type A fits
Seats fine — this plug is unearthed by design.
the full story
Type B fits
Seats and keeps its earth.
the full story

Faces drawn to scale from pin dimensions · verdicts are physical fit + voltage math, not safety advice — when in doubt, ask the hardware store, not the internet.