Monticello is an unincorporated community located in Sierra County, New Mexico, United States.

Monticello is located on Alamosa Creek, 22 miles (35 km) northwest of Truth or Consequences.

[4] These farms were owned by residents of a native New Mexican agricultural settlement named San Ygnacio de la Alamosa that had been founded in 1859.

Alamocita also was six miles north of Fort McRae established in April 1863 to protect these new settlements from the Apache, along with the traffic along the river and the old road to the east in the Jornada del Muerto.

This fort and its garrison would provide its protection and economic benefits to citizens of the towns over the years of its operation until it was closed on October 30, 1876.