Fairfield Township is one of twenty townships in Fayette County, Iowa, United States. As of the 2010 census, its population was 652.

According to the United States Census Bureau, Fairfield Township covers an area of 36.3 square miles (94 square kilometers).

• Arlington

• Taylorsville at 42°46′02″N 91°38′49″W / 42.767206°N 91.64682°W / 42.767206; -91.64682

(This list is based on USGS data and may include former settlements.)

• Illyria Township (north)
• Highland Township, Clayton County (northeast)
• Sperry Township, Clayton County (east)
• Cass Township, Clayton County (southeast)
• Putnam Township (south)
• Scott Township (southwest)
• Smithfield Township (west)
• Westfield Township (northwest)

The township contains these three cemeteries: Arlington, Corn Hill and Taylorville.

• Iowa Highway 187

• Brush Creek Canyon State Park

• North Fayette Valley Community School District
• Starmont Community School District

• Iowa's 1st congressional district
• State House District 24
• State Senate District 12

• United States Census Bureau 2008 TIGER/Line Shapefiles
• United States Board on Geographic Names (GNIS)
• United States National Atlas

• US-Counties.com
• City-Data.com