The minimum safe altitude is not dictated by the airspace, but by
whether you are VFR or IFR, and whether or not you are flying over
congested areas. For details see:

http://ecfr.gpoaccess.gov and go to 14CFR Part 91 section 119.



Mxsmanic wrote:
What regulations determine the absolute lowest altitude you can fly
above the ground in the U.S.? I understand that the area just above
the ground is usually Class G outside airports, and it only goes up to
700 or 1200 feet most of the time ... which implies that you can
actually fly at 500 feet AGL if you want. But is there some other
regulation that prohibits aircraft from flying this low, in general or
in certain conditions/areas?

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