Cairo is a very small city located in the state of Illinois. With a population of 1,523 people and two associated neighborhoods, Cairo is the 604th largest community in Illinois. Cairo has a large stock of pre-World War II architecture, making it one of the older and more historic cities in the country.

The city is relatively quiet, having a combination of lower population density and few of those groups of people who have a tendency to be noisy. For example, Cairo has relatively fewer families with younger children, and/or college students. Combined, this makes Cairo a pretty quiet place to live overall. If you like quiet, you will probably enjoy it here.

As is often the case in a small city, Cairo doesn't have a public transportation system that people use for their commute.

The citizens of Cairo are slightly less educated than the national average of 21.84% for the average city or town: 13.23% of adults in Cairo have a bachelor's degree or advanced degree

The per capita income in Cairo in 2022 was $25,276, which is low income relative to Illinois and the nation. This equates to an annual income of $101,104 for a family of four. However, Cairo contains both very wealthy and poor people as well.

Cairo is a very ethnically-diverse city. The people who call Cairo home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Cairo residents report their race to be Black or African-American, followed by White. Important ancestries of people in Cairo include German, Irish, Scottish, English, and Eastern European.

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