Colorado

41 inches

The greatest snowfall at Washington National by far was 28" in 1922. At Dulles, it was 32.4 inches Feb 5-6 2010.

A difficult question to answer precisely. According to the NOAA snowfall map, the greatest recorded daily snowfall in Colorado was 63 inches, in Georgetown, on December 4, 1913. They also record figures for 2-7 day snowstorms and a few other stats. URL: http://www.ncdc.noaa.gov/ussc/USSCAppController?action=map

From Wikipedia (http://en.wikipedia.org/wiki/Climate_of_the_United_States):

"On average, the mountains of the western states receive the highest levels of snowfall on Earth. The greatest annual snowfall level is at Mount Rainier in Washington, at 692 inches (1,760 cm); the record there was 1,122 inches (2,850 cm) in the winter of 1971-72. This record was broken by the Mt. Baker Ski Area in northwestern Washington which reported 1,140 inches (2,900 cm) of snowfall for the 1998-99 snowfall season."

Otherwise, as for actual cities, the top five for average annual snowfall, according to the National Oceanic and Atmospheric Administration (NOAA), are:

Marquette, Michigan

Sault Saint Marie, Michigan

Syracuse, New York

Caribou, Maine

Lander, Wyoming

Interestingly, Flagstaff, Arizona is #6.

Source: http://lwf.ncdc.noaa.gov/oa/climate/online/ccd/snowfall.html