Here are all the Russian athletes that competed at Paris 1900 :
In addition there was one athlete each from Ukraine
and Poland on the Russian team.
By Sport:
Russia:
full list for Russia
The OlyMADMen consider the athletes from Ukraine and Poland to be Russians and count 4 athletes on the Russian team.
This page is part of the site "Full Olympians" by Herman De Wael. See here for a full Introduction.