Washington is 20% more expensive than Pomona.
When comparing Washington, DC and Pomona, CA, the overall cost of living indices are 171 and 143 respectively (national median = 100). Rent is $162/month cheaper in Pomona, saving renters about $1,944/year.
Median household income is $27,418/year higher in Washington. Home values also differ significantly — the median in Washington is $724,600 compared to $569,600 in Pomona.
District of Columbia has a lower income tax rate, making Washington slightly more tax-friendly.
Washington vs Pomona — common questions
Other cost of living comparisons for Washington and Pomona