ZIP 80123 falls in Jefferson County, Colorado, where we hold 1,224 septic-related documents. We have not classified septic-versus-sewer status for this county, and we do not have a per-ZIP parcel count -- see the county page for what we hold and where the records are kept.
ZCTA 80123 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) |
|---|---|---|---|---|
| Jefferson County, Colorado | 50% | 1,224 | — | — |
| Arapahoe County, Colorado | 31% | 13,964 | — | — |
| Denver County, Colorado | 19% | 1 | — | — |
2 businesses on record with an address in this ZIP: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
| Company | City | Phone | Rating |
|---|---|---|---|
| Drain Terrier | Littleton | (720) 999-6120 | 4.3 (99) |
| Drain Wizard | Littleton | (303) 933-7246 | 1.9 (9) |
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 have not measured septic-versus-sewer status for this county yet.
ZIP 80123 spans 3 counties: Jefferson County, Colorado, Arapahoe County, Colorado, Denver County, Colorado.