Glassell Park is a neighborhood of Northeast Los Angeles, California, in the San Rafael Hills. The 2000 U.S. Census counted 23,469 residents in the 2.75-square-mile Glassell Park neighborhood—or 8,524 people per square mile, an average population density for the city. In 2021, the city estimated that the population was 22,911. The median age for reside…Glassell Park is a neighborhood of Northeast Los Angeles, California, in the San Rafael Hills. The 2000 U.S. Census counted 23,469 residents in the 2.75-square-mile Glassell Park neighborhood—or 8,524 people per square mile, an average population density for the city. In 2021, the city estimated that the population was 22,911. The median age for residents was 30, about average for the city and county.