Thayer is a very small city located in the state of Missouri. With a population of 1,900 people and two associated neighborhoods, Thayer is the 282nd largest community in Missouri.

The population of Thayer overall has a level of education that is slightly above the US average for all US cities and towns of 21.84%. Of adults 25 and older in Thayer, 21.94% have at least a bachelor's degree.

The per capita income in Thayer in 2022 was $20,083, which is low income relative to Missouri and the nation. This equates to an annual income of $80,332 for a family of four. However, Thayer contains both very wealthy and poor people as well. Thayer also has one of the higher rates of people living in poverty in the nation, with 34.00% of its population below the federal poverty line.

The people who call Thayer home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Thayer residents report their race to be White. Important ancestries of people in Thayer include English, Irish, German, Scottish, and Scots-Irish.

The most common language spoken in Thayer is English. Other important languages spoken here include Spanish and Italian.