Jaques Caillate was born on 20th July, 1658 in Geneva. Henri Melly was born on 20th July, 1730 in Geneva. Antoine-Frédéric Duhamel was born on 20th July, 1782 in Saint-Nicolas d'Aliermont. Adélaide Bloquet was born on 20th July, 1794 in Saint-Nicolas d'Aliermont. Louis-Pascal Denis was born on 20th July, 1804 in Saint-Nicolas d'Aliermont. Jean-François Viandier was born on 20th July, 1808 in Saint-Nicolas d'Aliermont. Alexandre-Paulin Fournier was born on 20th July, 1815 in Saint-Nicolas d'Aliermont. Marie-Madeleine Sellier was born on 20th July, 1815 in Les Grandes-Ventes. Louis-Auguste Huguenin was born on 20th July, 1822 in Le Locle. Charles-Auguste Louis Huguenin (Virchaux) was born on 20th July, 1840 in La Chaux-du-Milieu. Joséphine-Irma Gosselin was born on 20th July, 1846 in Saint-Nicolas d'Aliermont. Alberto Santos Dumont was born on 20th July, 1873 on the Fazenda Cabangu. Theodor René Beyer was born on 20th July, 1926 in Zürich.
François Huaud died on 20th July, 1729 in Geneva. Pascal-Honoré Gosselin died on 20th July, 1853 in Saint-Nicolas d'Aliermont. Marie-Catherine Andrieu died on 20th July, 1845 in Saint-Nicolas d'Aliermont. Rose-Françoise Paquet died on 20th July, 1869 in Saint-Nicolas d'Aliermont. Jean-Baptiste-Calixte Pequet died on 20th July, 1870 in Saint-Aubin-le-Cauf. Jakob Traugott Böhringer died on 20th July, 1901. Adolphe Julien LeCoultre died on 20th July, 1918 in Le Sentier.