ZIP codes in Monongalia County
23 ZIPs touch Monongalia County, West Virginia. The blue dashed line is the county border; orange ZIPs reach into it.
23
ZIP codes
8
cross the county line
160,611
people in these ZIPs
55
counties in WV
Most people
Monongalia County ZIP list
More counties in West Virginia
- Marshall County10
- Mason County19
- McDowell County37
- Mercer County22
- Mineral County10
- Mingo County23
- Monroe County15
- Morgan County4
- Nicholas County28
- Ohio County6
- Pendleton County10
- Pleasants County5
Questions people actually ask
How many ZIP codes are in Monongalia County, West Virginia?
23 ZIP codes reach into Monongalia County, including 4 PO Box or single-address ZIPs placed by the town they serve. 8 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Monongalia County has the most people?
26554 (Fairmont) has about 42,118 residents, the most of any ZIP touching Monongalia County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Monongalia 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 Monongalia 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