Mercer County Courthouse
|Motto: City of Pride and Progress |
|Elevation||736 ft (224 m)|
|Area||2.39 sq mi (6 km2)|
|- land||2.38 sq mi (6 km2)|
|- water||0.01 sq mi (0 km2)|
|Density||1,611.2 / sq mi (622 / km2)|
|Mayor||Chris Hagloch |
|- summer (DST)||CDT (UTC-5)|
Aledo is located at (41.200172, -90.749956).
According to the 2010 census, the city has a total area of 2.39 square miles (6.2 km2), of which 2.38 square miles (6.2 km2) (or 99.58%) is land and 0.01 square miles (0.026 km2) (or 0.42%) is water.The roads that pass through Aledo are Illinois State Route 17 (east-west) and Illinois State Route 94, which enters Aledo going north, then begins a one-mile concurrency with Route 17. About one-third of a mile east of Aledo, Route 94 branches off to the north again. 
As of the census of 2010, there were 3,640 people, 1,568 households, and 947 families residing in the city. The racial makeup of the city was 98.5% (3,586) White; 0.6% (22) African American; 0.0% (1) Native American; 0.3% (12) Asian; 0.1% (4) from other races; and 0.4% (15) from two or more races. Hispanic or Latino of any race were 1.2% (45) of the population.
There were 1,568 households out of which 24.5% had children under the age of 18 living in them, 49.0% were married couples living together, 3.6% had a male householder with no wife present, 7.8% had a female householder with no husband present, and 39.6% were non-families. 35.7% of all households were made up of individuals and 20.2% had someone living alone who was 65 years of age or older. The average household size was 2.20 and the average family size was 2.84.
The male population made up 47.5% (1,728), the female population made up 52.5% (1,912). There was 6.3% (229) of the population under 5 years; 17.1% (622) from 5 to 19 years; 10.3% (374) from 20 to 29 years; 10.2% (368) from 30 to 39; 12.5% (453) from 40 to 49; 12.9% (472) from 50 to 59; 12.1% (441) from 60 to 69; 8.2% (296) from 70 to 79; and 10.6% (385) were 80 years and over. The median age was 45.8 years.
The 2009-2013 American Community Survey estimated the median income in 2013 for a household in the city to be $39,424, and the median income for a family to be $56,546. Full-time, year-round male workers were estimated to have a median income of $44,435 versus $30,357 for females. The per capita income for the city was $21,373. About 15.0% of families and 18.4% of the population were estimated below the poverty line, including 22.1% of those under age 18 and 11.7% of those age 65 or over.
The American Community Survey estimated that in 2013 there were 1,740 civilians 16 years and over employed. Of those, 33.7% were estimated to be employed in educational services, health care or social assistance; 14.3% in manufacturing; 10.0% in construction; 8.4% in retail trade; 6.8% in professional, scientific, management, administrative or waste management services; 6.1% in finance, insurance, real estate, rental and leasing; 4.8% in arts, entertainment, recreation, accommodation or food services; and the remaining 15.9% in other (including agriculture, forestry, fishing and hunting, mining, wholesale trade, transportation and warehousing, utilities, information, public administration, and other services).
- Suzy Bogguss, country western singer
- Oscar E. Carlstrom, Illinois Attorney General
- Peaches Graham, catcher for the Cleveland Bronchos, Chicago Cubs, Boston Doves/Rustlers and Philadelphia Phillies
- Frank Lewis Marsh, educator and creationist
- Dewey McDougal, pitcher for the St. Louis Browns
- Guy C. Scott, Chief Justice of the Illinois Supreme Court and mayor of Aledo
- Judson Welliver, presidential speech writer
Aledo was the home to William & Vashti College (1908–1917) — the campus/buildings were purchased and used by the Roosevelt Military Academy from 1924–1973. The Administration Building was torn down, and the spot was used to construct an assisted living facility. The remaining two buildings (Niles Hall and North Hall) are unused. William & Vashti College was a member of the Illinois Intercollegiate Athletic Conference from 1910–1917.
The High School Mascot used to be the Aledo Green Dragons. School colors were Forest Green and White. The Class of 2006 had 71 students, which is about an average class size.
Aledo High School offers a variety of course curriculum in the sciences, math, literature, social sciences, and the arts. The school has a concert band, jazz band, concert choir, and swing choir. The school also offers a variety of athletics including volleyball, football, both men and women's golf, men and women's basketball, wrestling, track and field, softball, baseball, and cross country. Some extracurricular activities that students can become involved in are scholastic bowl, football, basketball, pon poms, cheerleading, flags, majorettes, and musicals.
From 1915 to 2009, Aledo High School competed in Boy Football. They qualified for the state tournament on 17 occasions since the tournament began in 1974. From 1998 to 2006, Aledo High School has reached the finals of five IHSA boys' football championship tournaments. Of those five, the school won three times.
Aledo School District #201 and Westmer School District #203 have consolidated since the 2009-2010 school year  The consolidation was voted upon by both school boards and was on the ballot for the 2008 election. The measure passed by a 76% margin.
The new consolidated district is Mercer County District #404 and the new mascot adopted by popular vote in early 2009 is the Mercer County Golden Eagles. School colors changed to navy blue and vegas gold. The Class of 2010 had over 120 students, well above the usual average.
Culture and media
Aledo hosts two annual festivals; the Rhubarb Fest and Antique Days. The Rhubarb festival, which is held every June in the city downtown, offers a variety of rhubarb-related activities, ranging from rhubarb pie sales to free rhubarb seed distributions. The festival additionally offers other crafts and forms of entertainment and music; it has been undertaken every year since 1991. The city of Aledo's Antique Days festivals likewise occur annually in the month of September, and includes a citywide food festival, music from local residents and the high school music departments, and sports competitions among communities in the area.
Aledo has its own radio station, known as WRMJ-FM. WRMJ features country music along with live sports and local programming. It broadcasts on a frequency of 102.3. The radio station serves most of Mercer County, and was founded in 1979.
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- "IHSA Boys Football Champions and Runners-Up". Illinois High School Association Statistics. Illinois High School Association. 2006. Retrieved 2008-10-09.
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- Blackford, Robert (September 10, 2008). "Aledo prepares for seventh annual Antique Days". The Times-Record. Retrieved 2008-09-22.
- "Station Profile". WRMJ-FM Radio Station. WRMJ 102.3 FM Radio. 2008. Retrieved 2008-09-22.