In article , Sam Takoy wrote:
Doug Miller wrote:
2008 NEC, Article 210.11(C)(3) requires a minimum of one 20A circuit to supply
bathroom receptacles -- but it does not prohibit installation of 15A circuits
in addition to the required 20A circuit.
[...]
That one 20A circuit is permitted to supply receptacles in *multiple*
bathrooms. It may not supply receptacles anywhere else, but it it *not*
required to have one 20A circuit *per bathroom*.

Do the same rules apply to first floor powder rooms?

I have no idea what you mean by a "powder room".

Here's what the NEC means by "bathroom":
"An area including a basin with one or more of the following: a toilet, a tub,
or a shower." [2008 NEC, Article 100]

NEC rules applying to bathrooms apply to any room meeting that definition,
regardless of what you call it, or what floor it's on.