ZIP codes in Worcester County

101 ZIPs touch Worcester County, Massachusetts. The blue dashed line is the county border; orange ZIPs reach into it.

101

ZIP codes

cross the county line

881,636

people in these ZIPs

counties in MA

Most people

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Worcester County ZIP list

More counties in Massachusetts

All 14 counties in Massachusetts

Questions people actually ask

How many ZIP codes are in Worcester County, Massachusetts?

101 ZIP codes reach into Worcester County, including 14 PO Box or single-address ZIPs placed by the town they serve. 4 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Worcester County has the most people?

01453 (Leominster) has about 43,851 residents, the most of any ZIP touching Worcester County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Worcester 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 Worcester 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.

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Updated 2026-11-10 · Where the data comes from