ZIP codes in Washington County
23 ZIPs touch Washington County, Rhode Island. The blue dashed line is the county border; orange ZIPs reach into it.
23
ZIP codes
0
cross the county line
130,344
people in these ZIPs
5
counties in RI
Most people
Washington County ZIP list
More counties in Rhode Island
Questions people actually ask
How many ZIP codes are in Washington County, Rhode Island?
23 ZIP codes reach into Washington County, including 3 PO Box or single-address ZIPs placed by the town they serve. Every ZIP area here lies wholly inside the county.
Which ZIP code in Washington County has the most people?
02852 (North Kingstown) has about 23,406 residents, the most of any ZIP touching Washington County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Washington County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Washington County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
Keep exploring
Updated 2026-11-10 · Where the data comes from