Lomax Township is one of eleven townships in Henderson County, Illinois, USA. As of the 2020 census, its population was 748 and it contained 367 housing units.

According to the 2021 census gazetteer files, Lomax Township has a total area of 33.02 square miles (85.52 km), of which 28.48 square miles (73.76 km) (or 86.26%) is land and 4.54 square miles (11.76 km) (or 13.74%) is water.

• Dallas City (north half)
• Lomax

• Iowa Junction at 40°41′14″N 91°03′37″W / 40.687263°N 91.060143°W / 40.687263; -91.060143

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

The township contains these four cemeteries: Clover, Crane, Freeland and Shaw.

• Illinois Route 96

As of the 2020 census there were 748 people, 337 households, and 263 families residing in the township. The population density was 22.65 inhabitants per square mile (8.75/km). There were 367 housing units at an average density of 11.12 per square mile (4.29/km). The racial makeup of the township was 94.12% White, 0.13% African American, 0.00% Native American, 0.53% Asian, 0.00% Pacific Islander, 1.07% from other races, and 4.14% from two or more races. Hispanic or Latino of any race were 3.74% of the population.

There were 337 households, out of which 28.50% had children under the age of 18 living with them, 70.92% were married couples living together, 5.93% had a female householder with no spouse present, and 21.96% were non-families. 18.70% of all households were made up of individuals, and 6.50% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.65.

The township's age distribution consisted of 18.8% under the age of 18, 8.2% from 18 to 24, 26.1% from 25 to 44, 25.3% from 45 to 64, and 21.5% who were 65 years of age or older. The median age was 43.9 years. For every 100 females, there were 96.5 males. For every 100 females age 18 and over, there were 96.6 males.

The median income for a household in the township was $53,988, and the median income for a family was $67,625. Males had a median income of $51,055 versus $31,979 for females. The per capita income for the township was $27,751. About 9.9% of families and 13.7% of the population were below the poverty line, including 29.9% of those under age 18 and 3.6% of those age 65 or over.

Historical population

Census	Pop.	Note	%±
2000	921		—
2010	850		−7.7%
2020	748		−12.0%
U.S. Decennial Census

• West Central Community Unit School District 235

• Illinois's 17th congressional district
• State House District 94
• State Senate District 47

• United States Census Bureau 2008 TIGER/Line Shapefiles
• "Lomax Township". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved September 19, 2009.
• United States National Atlas

• City-Data.com
• Illinois State Archives
• Township Officials of Illinois