2020 census

As of the census^[11] of 2010, there were 12,646 people and 5,523 households living in the city, The population density was 2,745.1 inhabitants per square mile (1,059.9/km²). The racial makeup of the city was 89.0% White, 5.3% African American, 3.0% Hispanic or Latino, 1.4% Asian, and 3.7% from two or more races.

There were 5,523 households, of which 19.0% had children under the age of 18 living with them, 78.2% were occupied by the owner, 86.7% were living in the same house 1 year ago and 5.4% spoke a language other than English at home. The average household size was 2.25.

In the city, 64.8% of residents were between 18 and 65 years of age, 20.3% older than 65, 19.0% between 18 and 5, and 4.9% younger than 5. The gender makeup of the city was 50.0% female and 50.0% male. The median household income was $67.356. In the city, 6.8% of people living in the city were living in poverty.

2010 census

As of the census^[11] of 2010, there were 12,750 people, 5,455 households, and 3,426 families living in the city. The population density was 2,747.8 inhabitants per square mile (1,060.9/km²). There were 5,780 housing units at an average density of 1,245.7 per square mile (481.0/km²). The racial makeup of the city was 92.8% White, 4.5% African American, 0.1% Native American, 0.8% Asian, 0.2% from other races, and 1.6% from two or more races. Hispanic or Latino of any race were 1.2% of the population.

There were 5,455 households, of which 26.3% had children under the age of 18 living with them, 44.5% were married couples living together, 13.3% had a female householder with no husband present, 5.0% had a male householder with no wife present, and 37.2% were non-families. Of all households 32.2% were made up of individuals, and 14.4% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.90.

The median age in the city was 44 years. 20.4% of residents were under the age of 18; 6.8% were between the ages of 18 and 24; 24% were from 25 to 44; 27% were from 45 to 64; and 21.7% were 65 years of age or older. The gender makeup of the city was 48.4% male and 51.6% female.

2000 census

As of the census^[3] of 2000, there were 13,484 people, 5,604 households, 3,754 families living in the city. The population density was 2,898.2 people per square mile. There were 5,787 housing units at an average density of 1,243.8 per square mile (480.2/km²). The racial makeup of the city was 95.37% White, 2.85% African American, 0.04% Native American, 0.79% Asian, 0.01% Pacific Islander, 0.09% from other races, and 0.85% from two or more races. 0.53% of the population were Hispanic or Latino of any race. According to Census 2000 20.2% were of Italian, 13.6% German, 13.4% Irish, 9.4% Polish, 9.0% Slovene and 6.4% English ancestry.

There were 5,604 households, out of which 23.2% had children under the age of 18 living with them, 53.2% were married couples living together, 10.3% had a female with no husband present, and 33.0% were non-families. Of all households 29.0% were made up of individuals, and 13.9% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.92.

In the city the population was spread out, with 20.1% under the age of 18, 6.7% from 18 to 24, 27.6% from 25 to 44, 22.6% from 45 to 64, and 23.0% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 94.6 males. For every 100 females age 18 and over, there were 90.4 males.

The median income for a household in the city was $43,500, and the median income for a family was $51,351. Males had a median income of $37,641 versus $27,847 for females. The per capita income for the city was $21,194. 6.5% of the population and 3.6% of families were below the poverty line. Out of the total population, 12.0% of those under the age of 18 and 5.5% of those 65 and older were living below the poverty line.

Primary and secondary education

The Wickliffe School District is all one building as of the 2023-2024 school year. Lower school, K-6, is taught on the first floor of the building, and upper school, 7-12, is located on the second story.

The public school mascots are known as the Wickliffe Blue Devils. There is also a Roman Catholic school, Mater Dei Academy, founded in 2010, which offers education for children in pre-school through grade 8.^[19]

Wickliffe High School, the associated athletic field, and Board of Education offices are located on the land occupied by the former estate of Frank Rockefeller, brother of John D. Rockefeller.^[20] The Board building was the previous carriage house for the Rockefeller estate.

Previously, there were two other elementary schools - Worden and Mapledale. These were closed in 1982. Around 2010, Mapledale was demolished and replaced by a housing community and golf course. Worden was also demolished and replaced by the Wickliffe Community Center.

Higher education

Wickliffe is home to Saint Mary Seminary and Graduate School of Theology, the Roman Catholic seminary serving the Diocese of Cleveland. It was established in 1848 by the first bishop of the Roman Catholic Diocese of Cleveland, Louis Amadeus Rappe.^[21] It is located at 28700 Euclid Avenue. The seminary was originally a high school built by the Sisters of Our Lady of Charity of the Good Shepherd. It housed the first Marycrest School for troubled girls. It was not a home for unwed mothers. The Good Shepherd Sisters sold the school building and grounds to the diocese for Boromeo Seminary use in the mid-1940s and moved the school to the Marcus Hanna estate in Independence, Ohio. Marycrest High School closed its doors on September 11, 2001.

Wickliffe is home to the Telshe Yeshiva, an Orthodox Jewish yeshiva which originated in Telz, Lithuania, and moved to Wickliffe after Lithuania fell to the Nazis in World War II.^[22]