| New Year's Day | Federal Holiday |  |
| Epiphany (The Three Wise Men Day) | Christian | |
| Orthodox Christmas | Orthodox | |
| Lee-Jackson Day | | |
| Stephen Foster Memorial Day | Observance | |
| Orthodox New Year | Orthodox | |
| Martin Luther King Jr. Day | Federal Holiday | |
| Robert E. Lee's Birthday | | |
| Idaho Human Rights Day | | |
| Civil Rights Day | | |
| Robert E. Lee's Birthday | | |
| Confederate Heroes' Day | | |
| Tu B'Shevat (Arbor Day) | Jewish Holiday | |
| Kansas Day | Observance | |
| National Freedom Day | Observance | |
| Black History Month | Observance | |
| Groundhog Day | Observance | |
| National Wear Red Day | Observance | |
| Rosa Parks Day | | |
| Isra and Mi'raj | Muslim | |
| Chinese (Lunar) New Year | Observance | |
| Lincoln's Birthday | | |
| Fat Tuesday / Mardi Gras | | |
| Valentine's Day | Observance | |
| Statehood Day in Arizona | | |
| Ash Wednesday | Christian | |
| Susan B. Anthony's Birthday | | |
| Elizabeth Peratrovich Day | | |
| Presidents' Day | Federal Holiday | |
| Daisy Gatson Bates Day | | |
| Linus Pauling Day | | |
| St. David's Day | Observance | |
| Read Across America Day | Observance | |
| Employee Appreciation Day | Observance | |
| Texas Independence Day | | |
| Casimir Pulaski Day | | |
| Town Meeting Day | | |
| Ramadan Begins | Muslim | |
| St. Patrick's Day | Observance | |
| Evacuation Day | | |
| Evacuation Day observed | | |
| March Equinox | Season | |
| March Equinox | Season | |
| Palm Sunday | Christian | |
| Purim | Jewish Holiday | |
| Maryland Day | | |
| Seward's Day | | |
| Prince Jonah Kuhio Kalanianaole Day | | |
| Maundy Thursday | Christian | |
| National Vietnam War Veterans Day | Observance | |
| Good Friday | | |
| Holy Saturday | Christian | |
| Easter | Observance, Christian | |
| César Chávez Day | | |
| Easter Monday | Observance, Christian | |
| César Chávez Day observed | | |
| Pascua Florida Day | | |
| Laylat al-Qadr (Night of Power) | Muslim | |
| National Tartan Day | Observance | |
| Army Day in United States | Multiple Types | |
| National Beer Day | Multiple Types | |
| Eid al-Fitr (End of Ramadan) | Muslim | |
| Thomas Jefferson's Birthday | Observance | |
| Father Damien Day | | |
| Tax Day | Observance | |
| Patriot's Day | | |
| Emancipation Day | | |
| San Jacinto Day | | |
| Oklahoma Day | | |
| Confederate Memorial Day | | |
| Passover (First Day) | Jewish Holiday | |
| Administrative Professionals Day | Observance | |
| Arbor Day | | |
| Confederate Heroes' Day | | |
| Confederate Memorial Day | | |
| Passover (Last Day in Diaspora) | Jewish Holiday | |
| Loyalty Day | Observance | |
| Law Day | Observance | |
| Lei Day | | |
| National Military Appreciation Month | Multiple Types | |
| National Mental Health Awareness Month | Multiple Types | |
| National Day of Prayer | Observance | |
| Orthodox Good Friday | Orthodox | |
| Kent State Shootings Remembrance | | |
| Rhode Island Independence Day | | |
| Orthodox Holy Saturday | Orthodox | |
| National Explosive Ordnance Disposal (EOD) Day | Observance | |
| Cinco de Mayo | Observance | |
| Orthodox Easter | Orthodox | |
| National Nurses Day | Observance | |
| Yom HaShoah | Jewish Commemoration | |
| Orthodox Easter Monday | Orthodox | |
| Truman Day | | |
| Ascension Day | Christian | |
| Confederate Memorial Day | | |
| Military Spouse Appreciation Day | Observance | |
| Mother's Day | Observance | |
| Yom Ha'atzmaut | Jewish Holiday | |
| Primary Election Day | | |
| Peace Officers Memorial Day | Observance | |
| National Defense Transportation Day | Observance | |
| Armed Forces Day | Observance | |
| Pentecost / Whit Sunday | Christian | |
| Whit Monday | Christian | |
| National Maritime Day | Observance | |
| Emergency Medical Services for Children Day | Observance | |
| Harvey Milk Day | | |
| National Missing Children's Day | Observance | |
| Trinity Sunday | Christian | |
| Lag B'Omer | Jewish Holiday | |
| Memorial Day | Federal Holiday | |
| Jefferson Davis' Birthday | | |
| Corpus Christi | Christian | |
| Statehood Day | | |
| Jefferson Davis' Birthday | | |
| D-Day | Observance | |
| National Children’s Day | Multiple Types | |
| Kamehameha Day | | |
| Shavuot | Jewish Holiday | |
| Army Birthday | Observance | |
| Flag Day | Observance | |
| Father's Day | Observance | |
| Bunker Hill Day | | |
| Eid al-Adha | Muslim | |
| Juneteenth | Federal Holiday | |
| Emancipation Day | | |
| American Eagle Day | Observance | |
| June Solstice | Season | |
| West Virginia Day | | |
| Independence Day | Federal Holiday | |
| Muharram / Islamic New Year | Muslim | |
| Bastille Day | Observance | |
| Pioneer Day | | |
| National Korean War Veterans Armistice Day | Observance | |
| Buffalo Soldiers Day | Observance | |
| National Parents' Day | Observance | |
| Colorado Day | | |
| Coast Guard Birthday | Observance | |
| Purple Heart Day | Observance | |
| National Veep Day | Multiple Types | |
| Victory Day | | |
| Tisha B'Av | Jewish Holiday | |
| Assumption of Mary | Christian | |
| Bennington Battle Day | | |
| Statehood Day in Hawaii | | |
| National Aviation Day | Observance | |
| Senior Citizens Day | Observance | |
| National Waffle Day | Multiple Types | |
| Women's Equality Day | Observance | |
| Lyndon Baines Johnson Day | | |
| Labor Day | Federal Holiday | |
| Carl Garner Federal Lands Cleanup Day | Observance | |
| National Grandparents Day | Observance | |
| California Admission Day | | |
| Patriot Day | Observance | |
| Mawlid / Prophet's Birthday | Muslim | |
| Constitution Day and Citizenship Day | Observance | |
| Air Force Birthday | Multiple Types | |
| National POW/MIA Recognition Day | Observance | |
| September Equinox | Season | |
| Emancipation Day | | |
| Native American Day | | |
| Gold Star Mother's Day | Observance | |
| Rosh Hashana | | |
| Feast of St Francis of Assisi | Christian | |
| Child Health Day | Observance | |
| Leif Erikson Day | Observance | |
| Yom Kippur | | |
| Navy Birthday | Observance | |
| Columbus Day | | |
| Native Americans' Day | | |
| Indigenous People's Day | | |
| White Cane Safety Day | Observance | |
| Boss's Day | Observance | |
| Unity Day | Multiple Types | |
| Sukkot Starts | Jewish Holiday | |
| Alaska Day | | |
| Sweetest Day | | |
| Hoshana Rabbah (Sukkot Ends) | Jewish Holiday | |
| Shemini Atzeret | Jewish Holiday | |
| Simchat Torah | Jewish Holiday | |
| Nevada Day | | |
| Navy Day | Observance | |
| National Immigrants Day | Multiple Types | |
| Mischief Night | Observance | |
| Halloween | Observance | |
| All Saints' Day | Christian | |
| All Souls' Day | Christian | |
| Election Day | | |
| Return Day | | |
| Marine Corps Birthday | Observance | |
| Veterans Day | Federal Holiday | |
| America Recycles Day | Multiple Types | |
| Thanksgiving Day | Federal Holiday | |
| Black Friday | | |
| State Holiday | | |
| Presidents' Day | | |
| Lincoln's Birthday/Lincoln's Day | | |
| Day After Thanksgiving | | |
| Family Day | | |
| American Indian Heritage Day | | |
| Small Business Saturday | Multiple Types | |
| Rosa Parks Day | | |
| First Sunday of Advent | Christian | |
| Cyber Monday | Observance | |
| St. Nicholas' Day | Observance | |
| Pearl Harbor Remembrance Day | Observance | |
| Feast of the Immaculate Conception | Christian | |
| Feast of Our Lady of Guadalupe | Observance | |
| National Guard Birthday | Observance | |
| Bill of Rights Day | Observance | |
| Pan American Aviation Day | Observance | |
| Wright Brothers Day | Observance | |
| December Solstice | Season | |
| Christmas Eve | | |
| Christmas Day | Federal Holiday | |
| Hanukkah Starts | Jewish Holiday | |
| Kwanzaa (1st Day) | Observance | |
| Day After Christmas Day | | |
| New Year's Eve | | |
