Washington and Downey have a similar cost of living.
When comparing Washington, DC and Downey, CA, the overall cost of living indices are 171 and 169 respectively (national median = 100). Rent is comparable in both cities, with less than $50/month separating them.
Median household income is $18,887/year higher in Washington. Home values also differ significantly — the median in Washington is $724,600 compared to $728,500 in Downey.
District of Columbia has a lower income tax rate, making Washington slightly more tax-friendly.
Washington vs Downey — common questions
Other cost of living comparisons for Washington and Downey