Colorado Tax Lien Sale Lists: Denver, Larimer, Grand, Arapahoe + County-Held Liens

Every parcel on Colorado county tax lien sale lists in one normalized table: parcel, situs address, legal description, tax, interest, fees, total due and (where published) county valuation with a lien-to-value ratio. It also includes county-held liens, which you can buy from the treasurer at face value with no auction premium.

Colorado tax lien certificates earn a statutory interest rate set each year, but every county publishes its sale list differently: Excel in one county, an old .xls in another, a two-column newspaper PDF in a third. This Actor reads each treasurer's own published files and gives you one clean dataset to screen before the auction.

Counties and lists

Key	List	Format at source	Rows in our Oct 2026 test
denver	Denver advertised list (2026 sale, 2025 taxes, plus prior years still delinquent)	XLSX	7,218
larimer	Larimer advertised list incl. county valuation (updated nightly by the county)	XLS	2,414
grand	Grand County legal-notice list (real property and mobile homes)	PDF	444
arapahoe	Arapahoe advertised list incl. county assessed value (treasurer "Viewable file", refreshed weekly; fully paid rows dropped)	XLSX	2,130
adams-county-held	Adams County county-held liens (no premium)	PDF	393

More counties are added as they publish machine-readable lists. Lists appear each fall ahead of the October-November sales.

Who uses it

• Tax lien investors screening thousands of parcels before bidding: filter by total due, lien-to-value and entity owners, then cross-check with the assessor.
• Analysts and researchers studying delinquency by county.
• Title, lending and property-data teams monitoring delinquent parcels.

Output fields

county, listType (advertised / county-held), taxYear, accountId, parcelId, situsAddress, city, zip, legalDescription, taxAmount, interestAmount, feesAmount, totalDue, propertyValue, propertyValueType, totalDueToValuePct, partiallyPaid, ownerIsEntity, ownerName (opt-in), notes, sourceUrl, sourceLastModified, retrievedAt.

Example input

{
  "counties": ["denver", "larimer", "grand", "arapahoe", "adams-county-held"],
  "latestTaxYearOnly": true,
  "minTotalDue": 500,
  "maxTotalDue": 10000
}

Example output

{
  "county": "Larimer",
  "listType": "advertised",
  "accountId": "1658145",
  "parcelId": "9524325120",
  "situsAddress": "1010 S LINCOLN AVE 120",
  "city": "LOVELAND",
  "zip": "80537",
  "taxAmount": 1737.31,
  "interestAmount": 104.25,
  "feesAmount": 15.0,
  "totalDue": 1856.56,
  "propertyValue": 330000,
  "totalDueToValuePct": 0.563,
  "ownerIsEntity": true,
  "ownerName": null
}

Privacy

Owner names appear in the counties' published legal notices, but for individuals they're personal data, so they're off by default. You still get ownerIsEntity (LLC, trust, HOA and so on) for screening. Turn on includeOwnerNames only if you have a legitimate need.

Pricing

Pay per lien record (see the Pricing tab). At the proposed $1.50 per 1,000 records, a full pull of all four lists (10,469 records in our test) would cost about $16. Use the filters to pay only for what you need.

Notes and limitations

• Amounts are as published by the county on the date shown in sourceLastModified. Taxes get paid down right up to the sale, so confirm with the treasurer or auction site before bidding.
• propertyValue is the valuation printed on the county's list, labeled as such. Counties differ on whether it's actual or assessed value.
• This Actor reads only the treasurers' own public downloads. It doesn't access auction platforms, place bids, or log in anywhere.
• Not investment advice.