Which countries celebrate Mother's Day in March?

Answer 1

Only the following countries celebrate Mother's Day (Or International Women's Day) in March:

(March 3)
Georgia

(March 8)
Afghanistan
Albania
Kosovo
Armenia†
Azerbaijan†
Belarus† (until 1996[16])
Bosnia and Herzegovina†
Bulgaria†
Croatia
Kazakhstan†
Laos
Macedonia†
Republic of Moldova†
Montenegro†
Romania†
Slovenia†
Serbia†
Tajikistan†
Vietnam†*

March 21 (vernal equinox)
Bahrain
Comoros
Djibouti
Egypt
Iraq
Jordan
Kuwait
Libya
Lebanon
Mauritania
Oman
Palestine
Qatar
Saudi Arabia
Somalia
Sudan
Syria
United Arab Emirates
Yemen

(March 25)
Slovenia

Note: Countries that celebrate International Women's Day instead of Mother's Day are marked with a dagger (†).

Answer 2

United States, Australia, Belgium, Canada, Denmark, Finland, Italy, Japan, and Turkey

Answer 3

Yes, all countries celebrate Mothers Day.