ZIP 80020 falls in Broomfield County, Colorado, where we hold 1 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 80020 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) |
|---|---|---|---|---|
| Broomfield County, Colorado | 60% | 1 | — | — |
| Boulder County, Colorado | 25% | — | — | — |
| Jefferson County, Colorado | 13% | 1,224 | — | — |
| Adams County, Colorado | 2% | — | — | — |
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 80020 spans 4 counties: Broomfield County, Colorado, Boulder County, Colorado, Jefferson County, Colorado, Adams County, Colorado.