ZIP codes in Sierra County
11 ZIPs touch Sierra County, New Mexico. The blue dashed line is the county border; orange ZIPs reach into it.
11
ZIP codes
2
cross the county line
11,714
people in these ZIPs
33
counties in NM
Most people
Sierra County ZIP list
More counties in New Mexico
- Rio Arriba County37
- Roosevelt County14
- San Juan County20
- San Miguel County23
- Sandoval County21
- Santa Fe County24
- Socorro County14
- Taos County21
- Torrance County10
- Union County9
- Valencia County9
Questions people actually ask
How many ZIP codes are in Sierra County, New Mexico?
11 ZIP codes reach into Sierra County, including 1 PO Box or single-address ZIPs placed by the town they serve. 2 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Sierra County has the most people?
87901 (Truth Or Consequences) has about 6,378 residents, the most of any ZIP touching Sierra County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Sierra 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 Sierra 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