The population of portland, oregon, has recently grown to more than 500,000. what is the order of magnitude for the number of people in portland?

In order to find the order, first we need to convert it into base-exponential form, 

Here, 5,00,000 = 5 * 10⁵

Now, Order means, "whole number" with exponential number. Here, Your whole number is 5

In short, Your Answer would be 5

Hope this helps!