If you're interested in learning more about the population and steets of Lowland City, Washington, you've come to the right place. Below is a brief overview of the population and steets of the city. Keep reading for more information. The population is approximately 4,300. As of the 2000 census, the city is home to a diverse population of both Native American and European heritage. The city is located in Pierce County, which is nearly 90% white. While Native American population has decreased to less than one percent over the past 150 years, other races are still underrepresented.