Lincoln County is a county in the U.S. state of New Mexico. As of the 2020 census, the population was 20,269. Its county seat is Carrizozo, while its largest community is Ruidoso. Lincoln County was named in honor of President Abraham Lincoln. It was once the largest county in the United States. In the late 1870s, the Lincoln County War began between ran…Lincoln County is a county in the U.S. state of New Mexico. As of the 2020 census, the population was 20,269. Its county seat is Carrizozo, while its largest community is Ruidoso. Lincoln County was named in honor of President Abraham Lincoln. It was once the largest county in the United States. In the late 1870s, the Lincoln County War began between ranchers and the owners of the county's largest general store. William Bonney, better known as Billy the Kid, became involved on the side of the ranchers after his friend and employer was killed. In the end, Bonney killed the county sheriff, a deputy, and the deputy that killed his friend. Several other people were slain in the conflict, which included the other leader of the rancher faction. His death ended the conflict. In 1878, the new territorial governor, retired Union General Lew Wallace, offered amnesty to the combatants to bring a long-lasting truce between the factions.