Martha Lake, Washington, is categorized as a "Moderate Diversity" neighborhood with a "White Plurality." As of 2022, the white population comprises 46% of the community, followed by Asian (26%) and Hispanic (14%) populations. The neighborhood's population increased from 18,019 in 2010 to 24,461 in 2022. Martha Lake's median income was $99,821 in 2022, above the national average. The neighborhood offers a lakeside setting within the greater Seattle metropolitan area.

Over the past decade, Martha Lake transitioned from a "White Majority" community to a "Moderate Diversity" neighborhood with a "White Plurality." In 2013, whites comprised 60% of the population. By 2022, this percentage decreased to 46%, while Asian and Hispanic populations increased. The community shows signs of becoming a "Transitional Community." The percentage of residents identifying as two or more races increased from 4% in 2013 to 6% in 2022. The Asian population grew from 19% in 2013 to 26% in 2022.

Martha Lake experienced economic growth alongside demographic changes. The median income rose from $88,608 in 2013 to $99,821 in 2022, a 12.7% increase. A notable spike in median income occurred in 2021 to $117,020, followed by a decrease in 2022. The population grew from 19,370 in 2013 to 24,461 in 2022, a 26.3% increase. This growth, combined with rising incomes and increasing diversity, suggests Martha Lake's attractiveness to various demographic groups.