99% of services in Mexico, Colombia and Venezuela are 220Y/127 V 60 Hz. Most newer apartments will have a three phase panel. Some houses have a "split phase" panel using only two of the 127V legs (this is similar to network service or MDUs in the United States and Canada). In underdeveloped areas, with construction that would not align with U.S. standards, each "structure" (shack) will have only a single phase 10, 15 or 20A breaker and neutral from the three phase network.
It is pretty rare to see, however, in rural regions and paths along highways, there may be a little baby single phase 127 volt transformer for small equipment (e.g. a billboard sign or small telecommunications equipment). Likewise, a house in the middle of nowhere can be served with a 127/254 V "split phase" transformer (exactly like 99% of houses in the United States and Canada). Any decent building will always have 220 or 254 V (the latter pretty rare) L-L available for air conditioning loads.
Brazil is an interesting mix of various services (akin to Japan, in a way). Most of the rest of South America uses 380Y/220 V 50 Hz or 400Y/230 V 50 Hz.
Hi:
I little clarification here: in Venezuela we mostly have 208Y/120V 60 Hz. Also you can have 277Y/480V 60 Hz mostly for industrial use and general services in buildings like shopping centers, office buildings, etc. In shopping centers and office buildings, 277V is mosly used for very large lighting circuits, and 480V for HVAC, elevators, electric escalators, and so on.
We also have split phase 120v/240V 60 Hz, but that´s not very common. You will find these services only in small residential areas, with little or no commercial activity at all.
Finally, on request, you can have a high leg delta service, although that´s not very common over here. I once saw, and measured, one high leg service in an industrial park near Caracas, but mostly you will find high leg delta services in Zulia state. I guess because that is the hottest part of the country, and full 240V three phase was needed to power air conditioning equipment. A venezuelan electrician not familiar with that, *will* make a big mess when working there, as Zulia, and it´s capital, Maracaibo, is the only city in Venezuela where high leg delta services are a common thing for residential and commercial buildings.
To summarize 220Y/127V 60 HZ it´s not an standard voltage here.