It is named in honor of Daniel Allerton, an early Bronx settler who purchased and farmed this area with his wife Hustace.

[4] The local subway is the IRT White Plains Road Line, served by the 2 and ​5 trains.

Mixed in were residents representing earlier 19th and 20th century migrations from Manhattan, largely of Irish and English-Irish extraction.

The New York City Department of City Planning had classified the southern part of the neighborhood as "Laconia" and the northern part as "Bronxdale", while Google Maps called the area "Bronxwood" (a historical name[5] also used for a nearby street) and Hagstrom Map called the area "Allerton".

[6] Based on data from the 2010 United States Census, the population of the combined Allerton-Pelham Gardens neighborhood was 28,903, an increase of 393 (1.4%) from the 28,510 counted in 2000.

A smaller longstanding Italian and immigrant Albanian population exist east of White Plains Road primarily in Bronxwood near Esplanade Avenue.

[13] In 2018, an estimated 21% of Allerton and Morris Park residents lived in poverty, compared to 25% in all of the Bronx and 20% in all of New York City.

Based on this calculation, as of 2018[update], Allerton and Morris Park are considered high-income relative to the rest of the city and not gentrifying.

[10]: 14 The concentration of fine particulate matter, the deadliest type of air pollutant, in Allerton and Morris Park is 0.0074 milligrams per cubic metre (7.4×10−9 oz/cu ft), less than the city average.

[10]: 13  In Allerton and Morris Park, 32% of residents are obese, 14% are diabetic, and 31% have high blood pressure—compared to the citywide averages of 24%, 11%, and 28% respectively.

[10]: 12 Eighty-three percent of residents eat some fruits and vegetables every day, which is lower than the city's average of 87%.

[23] Allerton and Morris Park generally have a lower rate of college-educated residents than the rest of the city as of 2018[update].

[10]: 6  The percentage of Allerton and Morris Park students excelling in math rose from 32% in 2000 to 48% in 2011, though reading achievement remained constant at 37% during the same time period.

[24] Allerton and Morris Park's rate of elementary school student absenteeism is slightly higher than the rest of New York City.

[11]: 24 (PDF p. 55) [10]: 6  Additionally, 74% of high school students in Allerton and Morris Park graduate on time, about the same as the citywide average of 75%.