ZIP 87521 falls in Rio Arriba County, New Mexico, where we hold 11,311 parcels measured as septic county-wide and 3,373 on sewer. We do not have a per-ZIP parcel count for this county, so this is the county total, not a count specific to ZIP 87521.
ZCTA 87521 is not entirely inside one county. Land-area share is from the 2020 Census ZCTA-to-county relationship file.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Rio Arriba County, New Mexico | 67% | — | 11,311 | 3,373 |
| Taos County, New Mexico | 33% | — | 9,087 | 6,998 |
Land-area overlap is from the 2020 Census Bureau ZCTA5-to-county relationship file, not an estimate of ours. Parcel and document counts are rows we hold, not a survey of every property in the ZIP. Last verified 2026-09-01.
We hold 11,311 parcels measured as septic for Rio Arriba County, New Mexico as a whole, not broken out by ZIP.
ZIP 87521 spans 2 counties: Rio Arriba County, New Mexico, Taos County, New Mexico.