| Fairfield | |
| Settlement Type: | Town |
| Mapsize: | 260px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Utah |
| Subdivision Type2: | County |
| Subdivision Name2: | Utah |
| Established Title: | Founded |
| Established Date: | 1855 |
| Founder: | John Carson |
| Named For: | Amos Fielding |
| Established Title1: | Incorporated |
| Established Date1: | December 20, 2004 |
| Population As Of: | 2010 |
| Population Total: | 119 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation Ft: | 4879 |
| Coordinates: | 40.2622°N -112.0931°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 84013 |
| Area Code: | 385, 801 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1427871 |
| Pop Est As Of: | 2019 |
| Population Est: | 145 |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 67.63 |
| Area Total Sq Mi: | 26.11 |
| Area Land Km2: | 67.56 |
| Area Water Km2: | 0.07 |
| Area Land Sq Mi: | 26.09 |
| Area Water Sq Mi: | 0.03 |
| Population Density Sq Mi: | 5.56 |
| Population Density Km2: | 2.15 |
Fairfield is a town in Utah County, Utah, United States. It is part of the Provo - Orem, Utah Metropolitan Statistical Area. It is located in the southwest corner of Cedar Valley about southwest of Salt Lake City and south of Cedar Fort on Utah State Route 73, west of Utah Lake. The population was 119 at the 2010 census.
The town was founded in 1855 when John Carson, his four brothers, and others settled in the Cedar Valley. The settlement was soon known as Frogtown. The population ballooned after the arrival of Johnston's Army in 1858-59, sent to Utah to suppress the rumored rebellion there. The army established a nearby camp called Camp Floyd, and the population grew to over 7,000, including 3,500 troops (nearly one-third of the entire U.S. Army at that time), teamsters, gamblers, and camp followers of various persuasions. With no rebellion taking place, the troops were recalled in 1861 and sent east to fight for the Union with the outbreak of the Civil War.
Frogtown became Fairfield in 1861, named after Amos Fielding, who had participated in establishing the community.
The Stagecoach Inn, located in Fairfield and now a museum, was used by travelers passing through via stagecoach, military personnel, and riders on the Pony Express trail.
Fairfield was incorporated in 2004 due to concerns about growth from surrounding communities. Besides agriculture, the town is a destination for Camp Floyd tourists and home to a large construction landfill.
As of the census of 2010, 119 people lived in the town. There were 41 housing units. The racial makeup was 95.8% White, 1.7% from some other race, and 2.5% from two or more races. Hispanic or Latino of any race were 4.2% of the population.
Fairfield has a continental climate (Köppen Dfb) bordering a semi-arid climate (BSk).