During the Black Hawk War of the mid-1860s, some Fairview residents moved to Mt. Pleasant for protection after a few men were killed in deadly skirmishes. Those who remained complied with Brigham Young's instructions to build a fort. By the end of 1866 a thick rock wall ten feet high enclosed the center of town. Within a few years, the conflict was essentially over and aggressive settlement and community development commenced. In the course of the ensuing decade, Fairview's population burgeoned to more than 1,000, making it the fourth largest in Sanpete by 1880. In 1900 and again in 1940 the town exceeded 1,700 people; however in 1980 the population was just 900, ranking Fairview sixth in size among the county's nineteen communities.