(northeast corner), Crenshaw and Venice Boulevards (southeast corner), Crenshaw and Pico Boulevards (southeast corner), Arlington Avenue and Venice Boulevard (northwest corner). The neighborhood of Country Club Park is located north of Pico Boulevard. Angelus Vista is located east of Arlington Avenue. The neighborhoods of Victoria Park and Lafayette Square are located west of Crenshaw Boulevard. West Adams Terrace is to the south. The Los Angeles Times Mapping L.A.project definition of Arlington Heights includes the adjacent neighborhoods of Country Club Park, Western Heights and Angelus Vista. Population The following statistics apply only to the area defined by the Los Angeles Times Mapping L.A. project: The 2000 U.S. census counted 22,096 residents in the 1.03-square-mile neighborhood—an average of 21,423 people per square mile, among the highest population densities in the county. In 2008, the city estimated that the population had increased to 23,330. The median age for residents was 31, about average for both the city and the county. Arlington Heights was said to be "highly diverse" when compared to the city at large. The ethnic breakdown in 2000 was: Latinos, 56.6%; blacks, 24.5%; Asians, 12.9%; whites, 4.7%; and others, 1.2%. Mexico (34,9%) and El Salvador (20.2%) were the most common places of birth for the 49.8% of the residents who were born abroad, a figure that was considered high in comparison with foreign-born in the city as a whole. The median household income in 2008 dollars was $31,421, considered low for both the city and the county. The percentage of households earning $20,000 or less was high, compared to the county at large. The household size of three people was just about average for Los Angeles. Renters occupied 81.6% of the housing units, and home- or apartment owners the rest. The percentages of never-married men (42.4%) and never-married women (35.9%) were among the county's highest. The census found 1,165 families headed by single parents, the 23.5% rate being considered high for both the city and the county. Arlington Heights residents aged 25 and older holding a four-year degree amounted to 13.9% of the population in 2000, about average for both the city and the county, although there was a high percentage of residents with less than a high school diploma. Historic-Cultural Monuments Original building for the Washington Irving branch library - 1802 South Arlington Avenue. Built in 1926, it became Los Angeles Historic-Cultural Monument 307 in 1986. Tate-McCoy Homestead - 1463–1469