Monmouth is a somewhat small city located in the state of Illinois. With a population of 8,650 people and two associated neighborhoods, Monmouth is the 242nd largest community in Illinois. Monmouth has an unusually large stock of pre-World War II architecture, making it one of the older and more historic cities.

In addition, Monmouth is a college town. There are a lot of students in Monmouth attending college, and as a result Monmouth provides a number of services, amenities and opportunities geared to the needs and activities of students.

Compared to the rest of the country, citizens of Monmouth spend much less time in their cars: on average, their commute to work is only 14.79 minutes. This also means that noise and pollution levels in the city are less than they would otherwise be.

The education level of Monmouth citizens, measured as those with bachelor's degrees or advanced degrees, is similar to the national average for all American cities and towns. 19.47% of adults 25 and older in Monmouth have a college degree.

The per capita income in Monmouth in 2018 was $27,553, which is lower middle income relative to Illinois and the nation. This equates to an annual income of $110,212 for a family of four. However, Monmouth contains both very wealthy and poor people as well.

Monmouth is a very ethnically-diverse city. The people who call Monmouth home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Monmouth residents report their race to be White, followed by Black or African-American. Monmouth also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 18.18% of the city’s residents. Important ancestries of people in Monmouth include German, Irish, English, French, and Swedish.

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