Liberia.

120/220 V · 50/60 Hz on Type A, Type B, Type C, Type E, Type F.

The record here is genuinely split: 120 V and 220 V supplies coexist, at either 50 or 60 Hz, feeding American flat-blade A and B sockets as well as round-pin C, E and F. Check the outlet and the appliance nameplate before plugging in anything that is not dual-voltage.

The voltage window

A nominal 120 V supply may legitimately sit anywhere between 108 and 132 V (±10%); A nominal 220 V supply may legitimately sit anywhere between 198 and 242 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

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

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Plug straight in — Liberia runs 120/220 V 50/60 Hz on Type A, Type B, Type C, Type E, Type F — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

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.