Scott County at a Glance
Scott County sits on the Iowa bank of the Mississippi River, forming the eastern anchor of the Quad Cities metro — which includes Davenport and Bettendorf on the Iowa side and Rock Island and Moline on the Illinois side. The Quad Cities is a manufacturing and logistics hub with John Deere, Rock Island Arsenal, and a growing tech and healthcare sector. For investors, the cross-border market context means you can compare Iowa's 24% rotational liens against Illinois's bid-down liens across the river — Iowa consistently offers better rate outcomes for individuals.
The Quad Cities straddles the Iowa-Illinois border, which puts Scott County investors in a unique position to compare the two neighboring lien states. Illinois runs a bid-down auction from 36% — in Rock Island County (the Illinois Quad Cities side), institutional buyers bid down rates on desirable residential parcels to 5–15%. Individual investors often end up with lower-quality inventory at compressed rates.
Scott County, Iowa uses the rotational format. Everyone who registers gets the full 24% rate regardless of competition level. For an individual investor covering the Quad Cities market, this means Scott County is structurally more favorable than Rock Island County. Same metro, same economy, very different return dynamics due to auction format alone.
The practical strategy for Quad Cities-area investors: focus your lien buying on the Iowa side (Scott County), use your Iowa knowledge to research Illinois properties for eventual resale exit markets, and understand the cross-state economic dynamics that influence property values and owner redemption behavior across the metro.
The Mississippi River runs along Scott County's eastern boundary, and portions of Davenport and LeClaire near the river carry flood risk. The 2019 Mississippi flooding caused significant damage along Davenport's riverfront. Unlike Cedar Rapids (which had one catastrophic event), the Mississippi is subject to periodic high-water events of varying severity.
Before registering interest in any Scott County parcel near the river: Check the FEMA Flood Map for current FIRM designation. Davenport notably does not have a federal flood wall — unlike many river cities — making some areas more exposed than their Illinois neighbors across the bridge. Verify the parcel's distance from the river and flood zone classification before bidding. Properties in AE zones face mandatory flood insurance on any financed resale.
How Scott County Tax Lien Sales Work
Rotational Assignment
Scott County holds its annual tax sale in June. Register interest in target parcels with the Scott County Treasurer before the registration deadline. The delinquent list is published in local media and on the treasurer's website. Multiple investors registering for the same parcel get assigned by rotation — you receive the full 24% rate regardless of how many others registered for the same parcel.
24% Annual — 2% Monthly
All certificates earn 24% per year at 2% per month from the sale date. No competitive bidding compresses the rate. The Scott County Treasurer issues a certificate confirming your lien position. Pay subsequent year taxes to add to your balance at the same 24% rate. Confirm deposit requirements (usually none) with the treasurer annually.
21 Months — Then Apply for Deed
Owners have 21 months to redeem by paying certificate balance plus accrued interest. After 21 months unredeemed, apply to the Scott County Treasurer for a tax deed with proper notice. For river-adjacent parcels, verify flood zone status before pursuing a deed — flood zone complications affect what you can do with a deed property. Iowa Code § 448 governs the process.
Key Details
| County seat | Davenport — Iowa's largest river city, Quad Cities anchor |
| Population | 172,288 (2020 Census) — 3rd most populous county in Iowa |
| Major cities | Davenport, Bettendorf, LeClaire, Blue Grass |
| Sale timing | Annual — June; confirm exact date with Scott County Treasurer each year |
| Sale format | Rotational assignment — no competitive bidding on rate |
| Interest rate | 24% per annum — 2% per month from sale date — Iowa Code § 447.1 |
| Redemption period | 21 months from date of sale — Iowa Code § 447.9 |
| Subsequent taxes | May be paid by certificate holder; earn 24% on those additional amounts |
| Mississippi flood risk | Verify FEMA FIRM for parcels near river — Davenport has no federal flood wall |
| Tax deed path | Apply to Scott County Treasurer after 21-month period with notice to owner — Iowa Code § 448 |
| County Treasurer | 563-326-8664 · scottcountyiowa.gov → |
| Statute | Iowa Code § 446 → · § 447 → · § 448 → |
Research Tools for Scott County
Scott County Treasurer
Annual sale schedule, delinquent parcel list, registration requirements, and certificate issuance. Contact directly for current year procedures and exact sale date.
scottcountyiowa.gov →Scott County Assessor
Assessed values, ownership records, and property characteristics. Cross-reference with the delinquent parcel list to evaluate certificate collateral before registering interest.
Scott County Assessor →FEMA Flood Map Service
Official FIRM flood zone designations. Davenport has no federal flood wall — check parcels near the Mississippi River. AE zone parcels face mandatory flood insurance on financed resale.
FEMA Flood Maps →City of Davenport Flood Information
Davenport's local flood risk maps, levee information, and flood-related planning resources. More localized than FEMA data for understanding specific neighborhood risk within the city.
Davenport Flood →Scott County Recorder
Deeds, mortgages, and all recorded instruments. Research prior encumbrances on any parcel where you plan to pursue a deed after redemption expires.
Scott County Recorder →Scott County GIS
Parcel boundaries, aerial imagery, zoning, and property data. Use to verify location relative to the Mississippi River and assess condition of surrounding properties.
Scott County GIS →City of Davenport Permits
Building permits, code violations, and inspections for Davenport city addresses. Check for open violations or demolition orders on distressed urban parcels before registering interest.
Davenport Building →Iowa DNR Environmental Sites
Contaminated sites and UST registrations. Check near the Mississippi River industrial corridor and any former manufacturing sites before registering commercial parcel interest.
Iowa DNR Sites →Quad Cities Area Realtor Association
Current Quad Cities market data — median prices and days on market across Davenport, Bettendorf, and surrounding areas. Verify exit market assumptions before pursuing deed-stage parcels.
QCAAR Stats →IRS Lien Search
Federal tax liens survive Iowa tax sales. Check commercial parcels and any property with prior business operations or known federal tax issues before registering interest.
IRS Lien Search →Iowa Code § 446 — Tax Sale
Governing statute for Iowa annual tax sales — registration, rotational assignment, and certificate procedures.
Iowa Code § 446 →Iowa Code § 448 — Tax Deed
Tax deed application after the 21-month redemption period — notice requirements and treasurer-issued deed process.
Iowa Code § 448 →Model Scott County lien returns before you register
Use the LTV Calculator to project 24% annual returns across your Scott County certificate portfolio, and the Parcel Tracker to log Mississippi River flood zone status and redemption deadlines.