| Jan 1 | New Year's Day |
| Jan 6 | Epiphany |
| Jan 7 | Orthodox Christmas Day |
| Jan 10 | Muharram/New Year |
| Jan 13 | Stephen Foster Memorial Day |
| Jan 18 | Lee Jackson Day (VA) |
| Jan 19 | Confederate Memorial Day (TX) |
| Jan 21 | Idaho Human Rights Day (ID) |
| Jan 21 | Martin Luther King Day |
| Jan 21 | New Hampshire Civil Rights Day (NH) |
| Jan 22 | Tu B'Shevat (Arbor Day) |
| Jan 27 | World Holocaust Victims Remembrance Day |
| Feb 1 | National Freedom Day |
| Feb 2 | Groundhog Day |
| Feb 4 | World Cancer Day |
| Feb 5 | Shrove Tuesday/Mardi Gras (AL*, LA) |
| Feb 6 | Ash Wednesday |
| Feb 12 | Lincoln's Birthday (CA, CT, IL, MO, NJ, NY) |
| Feb 14 | Valentine's Day |
| Feb 18 | Presidents' Day |
| Feb 18 | Daisy Gatson Bates Day (AR) |
| Feb 21 | International Mother Language Day |
| Mar 1 | St. David's Day |
| Mar 2 | Texas Independence Day (TX) |
| Mar 8 | International Women's Day |
| Mar 9 | Daylight Saving Time starts |
| Mar 15 | St. Patrick's Day |
| Mar 16 | Palm Sunday |
| Mar 17 | Evacuation Day (MA*) |
| Mar 20 | Prophet's Birthday |
| Mar 20 | Vernal equinox |
| Mar 20 | Maundy Thursday |
| Mar 21 | World Day to Eliminate Racial Discrimination |
| Mar 21 | Good Friday |
| Mar 21 | Purim |
| Mar 22 | Holy Saturday |
| Mar 22 | World Water Day |
| Mar 23 | Easter Sunday |
| Mar 23 | World Meteorological Day |
| Mar 24 | Easter Monday |
| Mar 25 | Maryland Day (MD) |
| Mar 25 | Day to Remember Slavery Victims and Transatlantic Slave Trade |
| Mar 26 | Prince Jonah Kuhio Kalanianaole Day (HI) |
| Mar 31 | César Chávez Day (CA, CO*, TX*) |
| Mar 31 | Seward's Day (AK) |
| Apr 2 | World Autism Awareness Day |
| Apr 2 | Pascua Florida Day (FL) |
| Apr 4 | United Nations' Mine Awareness Day |
| Apr 7 | United Nations' World Health Day |
| Apr 15 | Tax Day |
| Apr 15 | Father Damien Day (HI) |
| Apr 16 | Emancipation Day (DC) |
| Apr 20 | First day of Passover |
| Apr 21 | Patriot's Day (MA, ME) |
| Apr 21 | San Jacinto Day (TX) |
| Apr 22 | Oklahoma Day (OK) |
| Apr 22 | Earth Day |
| Apr 23 | World Book and Copyright Day |
| Apr 23 | Administrative Professionals Day |
| Apr 25 | Arbor Day (NE) |
| Apr 25 | Orthodox Good Friday |
| Apr 26 | Orthodox Holy Saturday |
| Apr 27 | Last day of Passover |
| Apr 27 | Orthodox Easter |
| Apr 28 | Confederate Memorial Day (AL, FL, GA, MS, TX) |
| Apr 28 | Orthodox Easter Monday |
| May 1 | Law Day |
| May 1 | Loyalty Day |
| May 1 | Ascension Day |
| May 1 | National Day of Prayer |
| May 2 | Yom HaShoah |
| May 3 | World Press Freedom Day |
| May 4 | Rhode Island Independence Day (RI) |
| May 5 | Cinco de Mayo |
| May 8 | Yom HaAtzmaut |
| May 8 | Time to Remember Lost Lives From World War II |
| May 8 | Truman Day (MO) |
| May 9 | 'Confederate Memorial Day' observed (SC) |
| May 10 | Confederate Memorial Day (NC, SC) |
| May 11 | Pentecost |
| May 11 | Mother's Day |
| May 12 | Whit Monday |
| May 15 | Peace Officers Memorial Day |
| May 15 | International Day of Families |
| May 16 | National Defense Transportation Day |
| May 17 | Armed Forces Day |
| May 17 | World Information Society Day |
| May 18 | Trinity Sunday |
| May 21 | World Day for Cultural Diversity |
| May 22 | Corpus Christi |
| May 22 | National Maritime Day |
| May 22 | World Biological Diversity Day |
| May 23 | Lag B'Omer |
| May 25 | African Liberation Day |
| May 26 | Memorial Day |
| May 29 | International Day of United Nations Peacekeepers |
| May 31 | World No Tobacco Day |
| Jun 1 | Statehood Day (KY, TN) |
| Jun 2 | Jefferson Davis Birthday (AL) |
| Jun 3 | Jefferson Davis Birthday (FL) |
| Jun 4 | World Day for Child Victims of Aggression |
| Jun 5 | World Environment Day |
| Jun 9 | Shavuot |
| Jun 11 | Kamehameha Day (HI) |
| Jun 14 | Flag Day |
| Jun 15 | Father's Day |
| Jun 17 | World Day to Combat Desertification |
| Jun 17 | Bunker Hill Day (MA) |
| Jun 19 | Juneteenth (27 states) |
| Jun 20 | West Virginia Day (WV) |
| Jun 20 | World Refugee Day |
| Jun 20 | June Solstice |
| Jun 23 | Public Service Day |
| Jun 26 | World Day to Support Torture Victims |
| Jun 26 | World Day against Drug Abuse and Trafficking |
| Jul 4 | Independence Day |
| Jul 5 | International Day of Cooperatives |
| Jul 11 | World Population Day |
| Jul 24 | Pioneer Day (UT) |
| Jul 27 | Parents' Day |
| Jul 31 | Isra and Mi'raj |
| Aug 9 | World Indigenous Peoples’ Day |
| Aug 10 | Tisha B'Av |
| Aug 11 | Victory Day (RI) |
| Aug 12 | International Youth Day |
| Aug 15 | 'Bennington Battle Day' observed (VT) |
| Aug 15 | Statehood Day in Hawaii (HI) |
| Aug 16 | Bennington Battle Day (VT) |
| Aug 19 | National Aviation Day |
| Aug 23 | World Day for Slave Trade Abolition |
| Aug 27 | Lyndon Baines Johnson Day (TX) |
| Sep 1 | Labor Day |
| Sep 2 | Ramadan begins |
| Sep 6 | Carl Garner Federal Lands Cleanup Day |
| Sep 7 | National Grandparents Day |
| Sep 8 | International Literacy Day |
| Sep 10 | World Suicide Prevention Day |
| Sep 11 | Patriot Day |
| Sep 15 | International Day of Democracy |
| Sep 16 | World Ozone Layer Day |
| Sep 17 | Constitution Day and Citizenship Day |
| Sep 19 | National POW/MIA Recognition Day |
| Sep 19 | International Talk Like a Pirate Day |
| Sep 21 | International Day of Peace |
| Sep 22 | Autumnal equinox |
| Sep 25 | World Maritime Day |
| Sep 27 | World Tourism Day |
| Sep 27 | Laylat al-Qadr |
| Sep 28 | World Rabies Day |
| Sep 28 | World Heart Day |
| Sep 28 | Gold Star Mother's Day |
| Sep 30 | Rosh Hashana |
| Oct 1 | International Day of Older Persons |
| Oct 2 | International Day of Non-Violence |
| Oct 2 | Eid-al-Fitr |
| Oct 4 | Feast of St Francis of Assisi |
| Oct 5 | World Teachers' Day |
| Oct 6 | World Habitat Day |
| Oct 6 | Child Health Day |
| Oct 8 | World Day for Natural Disaster Reduction |
| Oct 9 | Leif Erikson Day |
| Oct 9 | World Sight Day |
| Oct 9 | World Post Day |
| Oct 9 | Yom Kippur |
| Oct 10 | World Mental Health Day |
| Oct 13 | Indigenous People's Day (CA*) |
| Oct 13 | Native Americans' Day (SD) |
| Oct 13 | Columbus Day (All except HI, NV) |
| Oct 14 | First day of Sukkot |
| Oct 15 | White Cane Safety Day |
| Oct 15 | International Day of Rural Women |
| Oct 16 | Boss's Day |
| Oct 16 | World Food Day |
| Oct 17 | 'Alaska Day' observed (AK) |
| Oct 17 | World Day for Poverty Eradication |
| Oct 18 | Alaska Day (AK) |
| Oct 20 | Last day of Sukkot |
| Oct 21 | Shmini Atzeret/Simchat Torah |
| Oct 24 | United Nations Day |
| Oct 24 | World Development Information Day |
| Oct 27 | World Day for Audiovisual Heritage |
| Oct 28 | Diwali/Deepavali |
| Oct 31 | Nevada Day (NV) |
| Oct 31 | Halloween |
| Nov 1 | All Saints' Day |
| Nov 1 | All Saints |
| Nov 2 | Daylight Saving Time ends |
| Nov 2 | All Souls' Day |
| Nov 4 | Election Day |
| Nov 6 | World Day to Protect the Environment in War |
| Nov 10 | World Science Day |
| Nov 11 | Veterans Day |
| Nov 14 | World Diabetes Day |
| Nov 16 | World Day for Road Traffic Victims |
| Nov 16 | International Day for Tolerance |
| Nov 19 | International Men's Day |
| Nov 19 | World COPD Day |
| Nov 20 | Africa Industrialization Day |
| Nov 20 | Universal Children's Day |
| Nov 20 | World Philosophy Day |
| Nov 21 | World Television Day |
| Nov 25 | World Day to Eliminate Violence on Women |
| Nov 27 | Thanksgiving Day |
| Nov 28 | Black Friday |
| Nov 29 | World Solidarity Day with Palestinian People |
| Nov 30 | First Sunday Advent |
| Dec 1 | World AIDS Day |
| Dec 2 | World Day for Slavery Abolition |
| Dec 3 | World Day for Persons with Disabilities |
| Dec 5 | International Volunteer Day |
| Dec 7 | Pearl Harbor Remembrance Day |
| Dec 7 | International Civil Aviation Day |
| Dec 8 | Immaculate Conception |
| Dec 9 | Eid-al-Adha |
| Dec 9 | International Anti-Corruption Day |
| Dec 10 | Human Rights Day |
| Dec 11 | International Mountain Day |
| Dec 17 | Pan American Aviation Day |
| Dec 17 | Wright Brothers Day |
| Dec 18 | International Migrants Day |
| Dec 19 | International South-South Cooperation Day |
| Dec 20 | International Human Solidarity Day |
| Dec 21 | December Solstice |
| Dec 22 | First Day of Chanukah |
| Dec 24 | Christmas Eve |
| Dec 25 | Christmas Day |
| Dec 26 | Kwanzaa (until Jan 1) |
| Dec 29 | Last day of Chanukah |
| Dec 29 | Muharram/New Year |
| Dec 31 | New Year's Eve |
