| September 2023 | ||
|---|---|---|
| Date | Holiday | Where |
| September-1, Friday | Childhood Cancer Awareness Day | Georgia (Designated Days) |
| September-2, Saturday | Queen Lili‘uokalani Day | Hawaii (Observances) |
| September-4, Monday | Labor Day | Dist. of Columbia (Legal Holidays) |
| September-4, Monday | Labor Day | Arkansas, Illinois, New Jersey, US Banks, Wisconsin |
| September-4, Monday | Labor Day | Florida, Maryland, Massachusetts, New York (Legal Holidays) |
| September-4, Monday | Labor Day | Connecticut, Florida, Pennsylvania, United States Postal Service (Public Holidays) |
| September-4, Monday | Labor Day | Alaska, Arizona, Colorado, Delaware, Georgia, Hawaii, Idaho, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Mexico, North Carolina, North Dakota, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wyoming (State Holidays) |
| September-4, Monday | Labour Day | Federal (Federal Holidays) |
| September-4, Monday | Labour Day | New York Stock Exchange (NYSE Holidays) |
| September-4, Monday | Labour Day | Alabama, California (Public Holidays) |
| September-4, Monday | Labour Day | Ohio (State Holidays) |
| September-4, Monday | Marcus Whitman Day | Washington (Recognized Days) |
| September-9, Saturday | Fetal Alcohol Spectrum Disorders Awareness Day | Alaska (Designated Days) |
| September-10, Sunday | Family Day | New Mexico (Observances) |
| September-10, Sunday | Grandparents' Day | New Jersey (Designated Days) |
| September-10, Sunday | Grandparents’ and Family Caregivers’ Day | Florida (Designated Days) |
| September-10, Sunday | Great Grandparents Day | Illinois (State Commemorative Days) |
| September-11, Monday | Battle of Plattsburgh Day | New York (Designated Days) |
| September-11, Monday | Emergency Services Day | Missouri (Special Days) |
| September-11, Monday | Firefighter Day of Remembrance | New Mexico (Observances) |
| September-11, Monday | Firefighters' and Police Officers' Appreciation Day | Rhode Island (Days of Special Observance) |
| September-11, Monday | First Responders Day | North Carolina (Legal Holidays) |
| September-11, Monday | First Responders Day | Kentucky (Special Days) |
| September-11, Monday | Florida Missing Children’s Day | Florida (Designated Days) |
| September-11, Monday | National Day of Service and Remembrance | Maine (Special Observance Days) |
| September-11, Monday | Patriot Day | Alaska (Designated Days) |
| September-11, Monday | Patriot Day | Hawaii (Observances) |
| September-11, Monday | September 11th Day of Remembrance | Illinois (State Commemorative Days) |
| September-11, Monday | State Day of Remembrance | South Carolina (Special Days) |
| September-11, Monday | Texas First Responders Day | Texas (Designated Days) |
| September-12, Tuesday | Defenders' Day | Maryland (Legal Holidays) |
| September-13, Wednesday | Commodore John Barry Day | Pennsylvania (Special Days) |
| September-13, Wednesday | John Barry Day | New York (Designated Days) |
| September-13, Wednesday | Older Alaskans' Day | Alaska (Designated Days) |
| September-14, Thursday | National Anthem Day | Pennsylvania (Special Days) |
| September-15, Friday | New Jersey P.O.W.-M.I.A. Recognition Da | New Jersey (Designated Days) |
| September-15, Friday | New York State POW/MIA Recognition Day | New York (Designated Days) |
| September-15, Friday | Pennsylvania POW/MIA Recognition Day | Pennsylvania (Special Days) |
| September-15, Friday | POW-MIA Recognition Day | Vermont (Designated Days) |
| September-15, Friday | POW-MIA's Day | Rhode Island (Days of Special Observance) |
| September-15, Friday | POW/MIA Recognition Day | Oklahoma, South Dakota (Designated Days) |
| September-15, Friday | POW/MIA Recognition Day | Arkansas (Observances) |
| September-15, Friday | POW/MIA Recognition Day | Missouri, South Carolina (Special Days) |
| September-15, Friday | POW/MIA Recognition Day | Maine (Special Observance Days) |
| September-15, Friday | POW/MIA Recognition Day | Illinois (State Commemorative Days) |
| September-15, Friday | Prisoners of War and Missing in Action Recognition Day | Alaska (Designated Days) |
| September-15, Friday | Rosh Hashanah | Texas (Optional Holidays) |
| September-16, Saturday | Cherokee Strip Day | Oklahoma (Designated Days) |
| September-16, Saturday | Texian Navy Day | Texas (Designated Days) |
| September-17, Sunday | Constitution Commemoration Day | Arizona (Legal Holidays) |
| September-17, Sunday | Constitution Day | Nevada (Periods of Observance) |
| September-17, Sunday | Constitution Day | Maine (Special Observance Days) |
| September-17, Sunday | Constitutional Commemorative Day | Idaho (Special Days) |
| September-17, Sunday | Friedrich Wilhelm von Steuben Memorial Day | New York (Designated Days) |
| September-17, Sunday | Puerto Rico Day | New Jersey (Designated Days) |
| September-17, Sunday | Tennessee and United States Constitutions Day | Tennessee (Days of Special Observance) |
| September-19, Tuesday | IT Professionals Day | Missouri (Special Days) |
| September-19, Tuesday | Preventing Lost Potential Day | Illinois (State Commemorative Days) |
| September-20, Wednesday | Dr. Hector P. Garcia Day | Texas (Designated Days) |
| September-20, Wednesday | Farmer Suicide Prevention Day | Kentucky (Special Days) |
| September-20, Wednesday | Hispanic Journalist Pride Day | New Jersey (Designated Days) |
| September-21, Thursday | Peace Day | Hawaii (Observances) |
| September-22, Friday | Michigan Indian Day | Michigan (Designated Days) |
| September-22, Friday | Native American Day | New Jersey (Designated Days) |
| September-22, Friday | Native American Day | California (Optional Holidays) |
| September-22, Friday | Native American Day | Nevada (Periods of Observance) |
| September-23, Saturday | Gold Star Family Day | Illinois (State Commemorative Days) |
| September-23, Saturday | Native-American Day | New York (Designated Days) |
| September-23, Saturday | Public Lands Day | Washington (Recognized Days) |
| September-24, Sunday | American Indian Heritage Day | Rhode Island (Days of Special Observance) |
| September-24, Sunday | Gold Star Family Day | Hawaii (Observances) |
| September-24, Sunday | Gold Star Mother's Day | Tennessee (Days of Special Observance) |
| September-24, Sunday | Gold Star Mother's Day | New Jersey, Texas (Designated Days) |
| September-24, Sunday | Gold Star Mothers' Day | New York, North Dakota (Designated Days) |
| September-24, Sunday | Gold Star Mothers' Day | Illinois (State Commemorative Days) |
| September-24, Sunday | Parents of Fallen Military Sons and Daughters Day | New Jersey (Designated Days) |
| September-25, Monday | American Indian Day | Tennessee (Days of Special Observance) |
| September-25, Monday | Ataxia Awareness Day | Rhode Island (Days of Special Observance) |
| September-25, Monday | Canterbury (South) | Virgin Islands (Regional Anniversary Dates) |
| September-25, Monday | Heritage Day | Virgin Islands (Public Holidays) |
| September-25, Monday | Indigenous Peoples Day | Illinois (State Commemorative Days) |
| September-25, Monday | Yom Kippur | North Carolina (Legal Holidays) |
| September-25, Monday | Yom Kippur | Texas (Optional Holidays) |
| September-26, Tuesday | Mesothelioma Awareness Day | Kentucky (Special Days) |
| September-27, Wednesday | A Day of Prayer for Kentucky's Students | Kentucky (Special Days) |
| September-27, Wednesday | First Responder Appreciation Day | Oregon (Commemorations) |
| September-29, Friday | American Indian Heritage Day | Montana (Days of Special Observance) |
| September-29, Friday | American Indian Heritage Day | Texas (Designated Days) |
| September-30, Saturday | Public Lands Day | Nevada (Periods of Observance) |
| September-30, Saturday | War of 1812 Day | New York (Designated Days) |