East San Mateo, a neighborhood in San Mateo, California, exhibits Moderate Diversity with a White Plurality as of 2022. The racial composition comprises whites (39%), Asians (29%), and individuals of two or more races (15%). The neighborhood's median income in 2022 was $122,578, indicating a relatively affluent area. East San Mateo is located near the San Mateo Japanese Garden, a cultural landmark reflecting the area's historical Asian influence.

Over the past decade, East San Mateo has undergone a transition in its racial composition. In 2013, the neighborhood had a White Plurality, with whites comprising 43% of the population. By 2016, it briefly shifted to a White Majority at 54%. From 2017 onwards, the area has consistently maintained a state of Moderate Diversity. The most significant changes include a decrease in the white population from 54% in 2016 to 39% in 2022, an increase in the Asian population from 11% in 2014 to 29% in 2022, and a rise in residents identifying as two or more races, from 4% in 2015 to 15% in 2022.

These shifts suggest a trend towards increasing diversity, potentially categorizing East San Mateo as a Transitional Community. The median income in East San Mateo has shown an upward trend, rising from $96,623 in 2013 to $122,578 in 2022, an increase of about 27%. This economic growth has coincided with the increasing diversity of the neighborhood. The population has fluctuated over the years, peaking at 2,098 in 2018 and dropping to 1,514 in 2022.